How To Make DropdownList No Postback Sep 12, 2011. This is done by saving the data / class objects / variable in a ViewState object and then fetching it from it whenever needed. [Solved] DropDownList Selected Value getting lost on PostBack in ASP. When user hits Save, I do a postback and save these values into the database. How to Make a Drop-Down List Change Depending on Selection in a Different List in Microsoft Excel Enter the values you need for the first drop-down list in column A on the new sheet. ProductName. Selected Index Changed event for asp:DropDownList (VB. When a postback occurs, the TextBoxes keep their values, but the DropDownLists lose their ListItems. So to retrieve the selected values we will use ViewState as shown below. net dropdownlist control. However, once I click on submit in that dialog, the textbox value is null. Who knew eight practices could feel so thorough? Because while we've only seen the Carolina Panthers take the field a week's worth of training camp, including at Fan Fest on Friday night in. So the ddl is set to autopostback and in the detailsView Load handler I show/hide the fields as needed, which works. thanks in advance. Hi, I have a dropdownlist in side a gridview, Onselectedindexchanged I want to some action. Net [Solved] Bootstrap Modal Popup Auto Closes on PostBack in ASP. As I noted, since the DropDownList does not provide updated values upon postback of a form, I use the ASP. ) The problem might be in the LoadPostData. How can I make dropdownlist no postback - I have a dropdownlist which I put a code in selected indexchanged - basically for every indexchanged the code will connect to sql and get values then populate textboxes with values. Hai all,I am face the problem with dropdownlist value inside gridview. I'll have to admit, this is one of the only unfortunate nuances that I've come across in the ASP. 2) If the attribute is present I checked if it has some value which the user entered/selected before postback. Event validation is enabled. Selecting items from listbox without postback i have a listbox which shows some categories in a listbox and a checkbox list for each of the selected categ. Here is some example code for overriding the render method (in VB and C#) and declaring a potential value for the dropdownlist ddCar. Answered Active Solved. NET MVC Today, we go from a beginner of SELECT tags to the mastery of DropDownLists, ListBoxes, and other types of lists in your MVC Views. by Scott Mitchell. Unfortunately, on my home PC that has Windows 7 and IE 8 installed, the drop-down menus just do not work (they do on my office PC that has XP Professional and IE 7). On Load I'm populating it with values, but upon submit ie. if javascript adds a new value, when the postback is processed on the server, the server side DropDownList has no matching item to select. But on PostBack, the DropDownList controls have lost all the ListItem options not even the SelectedValue! any items and since the selected value is based on. After the great custom drop-down list styles made by Hugo in his tutorial Custom Drop-Down List Styling, we wanted to make it simple to create a custom structure from a normal select input (without multiple option selection). 6m developers to have your questions answered on How to persist DropDownList selected index and value on postback from RadGrid FilterTemplate of UI for ASP. in oninit you need to add code on the server side that adds the new value to the DropDownList. Can any one helpme out in stoping the PostBack. I want the drop down box to be on a different worksheet. DropdownList and i am populating it with data, but whenever postback occurs the selected value of the dropdown lost. Net AJAX for SharePoint. 1) Checked if the text box has the attribute called “Value” present. It seems like my 2nd DropDown is bounded on every postback even if it's not because of SelectedIndexChanged of my 1st DropDown. Dynamically created DropDownList loses selected Item on Postback When click import button, this will displays a first item from dropdownlist only. I am populating a dropdownlist based on the selection from another dorpdownlist. The drop down will have a list of Employee names. NET AJAX Persistence Framework. Here Mudassar Ahmed Khan has explained with an example, how to prevent the Selected Item Value of ASP. Controls are losing values on postback Hello I have two dropdowns in a gridview that need cascading functionality but I have experianced problems with the cascading drop down extenders in the past so I have decieded to write my own javascript. Dynamic Controls Lost On Postback. I'll have to admit, this is one of the only unfortunate nuances that I've come across in the ASP. But on PostBack, the DropDownList controls have lost all the ListItem options not even the SelectedValue! any items and since the selected value is based on. In my previous article I had discussed How to bind IList with MVC dropdownlist. So the ddl is set to autopostback and in the detailsView Load handler I show/hide the fields as needed, which works. One of my more reliable defenders, even though he did lose his place in the side a couple of times for inconsistent form, and he is 31 years old now, the truth is that Teddy has always been a. So to retrieve the selected values we will use ViewState as shown below. Form except CheckBoxList control. if i select country from ddlcountry , country related states comes in ddlstates. If you don't want to do a postback on adding every and each hobby, you can either: - use a session variable to store the edited user's state and add the hobbies with an ajax call - use a multiselect listbox instead of dropdowns. Download Sample App or Download PDF. the filtering is working fine but on every postback the dropdown list seleted value is reset to default value. [Solution]Dropdownlist not retaining selected item on Postback Introduction In this article we will look into an alternative solution to the problem with dropdownlist where selecteditems are not retained on postback. Join a community of over 2. In this short tutorial i would like to show you how easily to set default option value when you do not have data yet for DropDownlist. Here Mudassar Ahmed Khan has provided solution to the problem where value of the TextBox placed in GridView is lost after PostBack in ASP. DropDownList Values getting cleared after PostBack in ASP. The problem is that on postback the system only gives me values for combo boxes that were changed by the user. On selection of country i have populated its states using selectedindexchanged event of ddlCountry. If the runtime sees a value it doesn’t know about, it throws an exception. Introduction In this article we will see how to use the DropDownList control in ASP. Another postback occurs, the value is picked up and written to XML, no more problems. View 4 Replies Similar Messages: Losing Textbox Value On Postback? Jun 9, 2010. All, I've been banging my head against the wall for hours now, and my co-workers don't have an. I assign the datasource on every postback but i only do a databind when the page loads for the first time. net 2 anonymous bug delegate foreach interation loops Named Pipes Opener Popup Postback refresh Remote Debug ViewState VIsual Studio __doPostBack. ProductName. Inside page load event i first checked whether it is postback, if yes then i am setting the value attribute of textbox with the value of password textbox. Datatable Reload Without Postback. We get the value of the selected item in the DropDownList by casting sender, then we add Key and Value if key does not exist or reset value of the existing key to a new value. Hai all,I am face the problem with dropdownlist value inside gridview. As long as there is no postback happening, I see the list getting populated correctly but after a postback, my dropdownlist is empty. In tabs I have a Standard (not devexpress) textbox control and DropDownList. NET Forums on Bytes. But in the postBack the selected values cannot be retrieved. it is called only on postback, not on. (PROBLEM) 6. Well you should remember that each page is different so while navigating from one page to another the only way you can keep the value is by say storing it in session and in the master page set it to the selected value. NET application we are all familiar with DropDown but as we moved to MVC we lost our favorite ASP. In day to day life in programming we make use of Properties to pass data from Page to Web User Control and vice versa in asp. can perform PostBack. A long the same line, you may often asked to enter the 2 letter initials of your state from a drop-down menu as well. NET controls like DropDown, Gridview etc. I need to retain its value in every postabck(. Creating forms for the web is one of them. DropDownList Values getting cleared after PostBack in ASP. Problems creating a foreign key in Sql Server: Update or Add Custom Field in JIRA using Atlassian C# API: AutoCompleteExtender bug with Bing Maps. The ID of the control, “DropDownList1,” is also passed to the _doPostBack function and stored in the _EVENTTARGET hidden field. I am using AjaxFileUpload for upload multiple files. net c# example code demonstrate us how can we reset the dropdownlist on postback in an asp. On the first postback, the DropDown loses its selected value and goes back to default. Download Sample App or Download PDF. Well you should remember that each page is different so while navigating from one page to another the only way you can keep the value is by say storing it in session and in the master page set it to the selected value. DropdownList and i am populating it with data, but whenever postback occurs the selected value of the dropdown lost. Dim column_name As String = column_x. This property can use viewstate to store its value rather than a member variable that would lose the value over a postback. and what about a dynamically created requiredfieldvalidator for a dynamically created textbox or dropdownlist in a webUserControl(. net dropdownlist without postback The following asp. I tried to reload the page from the onchange event of the first drop down but this loses the selected value. We have confirmed this (unable to obtain the “id” of the selected item during postback) as bug and a defect report has been logged for this. Any pointers?. While the new option is added to the dropdownlist, if the dropdownlist is set to AutoPostback=true and has a script to run OnSelectedIndexChanged the dropdownlist resets and the value suddenly no longer exists. textbox value lost upon postback - ASP. When using the debugger it is very clear that on creation my ListItems are created as I want them. Maintain the dynamic control events, data during postback in asp. Hai all,I am face the problem with dropdownlist value inside gridview. Master/Detail Filtering With a DropDownList (VB) 03/31/2010; 7 minutes to read +1; In this article. How to select an item in a DropDownList by value Asp. postback the DropDownList box is losing the values. The CascadingDropDownList extender, which comes with the AjaxControlToolkit library, is designed to work with a web service. Dynamic Controls Lost On Postback. it is normal that value will gone after postback, store in session or viewstate to retain the value - Se0ng11 Aug 5 '14 at 10:29 use UpdatePanel and put this DropDownList and LinkButton inside it. NET controls like DropDown, Gridview etc. AJAX TabContainer - losing ListBox data on postback. ColumnName <<< This line. This makes Semantic UI dropdown useless in the ASP. The Scaffolding method. Here is the code with the control that I am trying to run a postback with; the id. I used VRM_SET_VALUES and VRM_GET_VALUES for populating the values from the programand not use any domain level value table for. Hi, Im trying to make my own web custom control. net dropdownlist without postback The following asp. As long as there is no postback happening, I see the list getting populated correctly but after a postback, my dropdownlist is empty. I also used Updatepanel but after that the action what I want its not happening. This was the reason why value was getting lost (blank) whereas in actuality value was getting selected. Upon return it places the value in the textbox (client side script). The Demo & Download links are. Your speed will fall from 60 to 1 and your car's horsepower will drop down from 250 to 5. DropDownList in Templated Control losing Items value on postback I'm using a DropDownList control in a Templated Control. ascx) on a page. How to populate a DropDownList based on another DropDownList selected value? Populate Dropdown on the basis of another dropdown value in PHP using Create Multiple Dependent Drop Down Lists. losing attributes on postback; adding a value to Session object; Adding an additional option to a bound dropdown list; Adding dropdownlist to a datalist; moving items from one list box to another; Removing Items From A preloaded Dropdown list Please help; Dynamically adding DropDownList - if I set ID also, I lose PostBack EventHandler. Just for a better appearance. The page on_load event loads the default value of each dropdown box. In the Page_Load I fetch the value of the _EVENTTARGET variable which in this case is the ID of the DropDownList. how to retain value of dropdown list after postback which is extended by ajax cascading dropdownlist extendar. As long as there is no postback happening, I see the list getting populated correctly but after a postback, my dropdownlist is empty. You can find dropdownlist in visual studio's standard controls group. I am working with VS 2010, in Windows7, on IIS7. Hi, Can you further elaborate your problem? your retain value is for nxt drop down list? how many drop down list you have?. This invalid code for dropdownlist caused the issue. AutoPostBack property allows controls which cannot submit the Form (PostBack) on their own and hence ASP. DropdownList to preserve the value. It's common to spend hours on something trivial, such as displaying a selected value in a DropDownList on postback, or getting that selected value in a controller. Hi, All of you. net c# example code demonstrate us how can we get the DropDownList web server control's Selected item while DropDownList AutoPostBack property set to false. Using Auto-Postback with CascadingDropDown (C#) 06/02/2008; 2 minutes to read +1; In this article. Hello, Am facing this peculiar problem with a dropdownlist in the Gridview. I had this issue when dynamically populating a drop down box using javascript on a previous user selection. Postback occurs due to another event on the form. Last Reply on Nov 14, 2016 09:43 AM By dharmendr. I want the drop down box to be on a different worksheet. This is useful if you have a DropDownList control whose AutoPostBack property is set to True and whose postback is typically long-running. The CascadingDropDown control in the AJAX Control Toolkit extends a DropDownList control so that changes in one DropDownList loads associated values in another DropDownList. In other words, the contents of the form are POSTed back to the same URL as the form. *When the drop down list value changes and the postback occurs the data that I had. When I click on submit button, it register a blank value in my database. In this tutorial we'll see how to display the master records in a DropDownList control and the details of the selected list item in a GridView. NET Data Grid Control. net using c#. I see many people coming across same issue of how to set the SelectedValue of a DropDownList that is inside of a GridView. NET form elements. In the above code a dynamic label is created to show some gap between newly created dropdownlist. 0; Connected web parts - provider empty on postback when consumer; Web Part Provider Interface is null on every-other postback; Dropdownlist in Master Page; Populate dropdownlist from sql server 2000 database; DropDownList autofill behavior; DropDownList. Join a community of over 2. NET controls like DropDown, Gridview etc. net webpage code-behind. But each postback clears any text field data input or selected. net - DropDownList After Postback All Values/index Lost. NET Forums on Bytes. Problems creating a foreign key in Sql Server: Update or Add Custom Field in JIRA using Atlassian C# API: AutoCompleteExtender bug with Bing Maps. DropDownList Within Composite Control Is Losing Selected Value On Postback Feb 23, 2010 I am building a composite server control that currently only has a TextBox and a DropDownList. When we move forward, God's power is unlimited to break barriers, overcome obstacles, and trounce the enemy. Hi, All of you. Introduction In this article we will learn how to maintain the state of dynamically created controls in asp. private void CreateDropdownListEmployee(string id,Panel pnl,. ixxx but i keep losing my DDL value every time i change from one page to another page. I am populating a dropdownlist based on the selection from another dorpdownlist. net - Dropdownlist Is Cleared On Page Postback; Remain Index Of Dropdownlist After Postback? Asp. The Scaffolding method. NET MVC Today, we go from a beginner of SELECT tags to the mastery of DropDownLists, ListBoxes, and other types of lists in your MVC Views. Hello, Am facing this peculiar problem with a dropdownlist in the Gridview. This works fine, but now the users want another drop down box to be added and filled with different options depending on what they pick from the first drop down box. Problem is not able to find the dropdown list's selected values. In this short tutorial i would like to show you how easily to set default option value when you do not have data yet for DropDownlist. when i m using the hiddenfield in the master pageit says it doesnt not exit in the page behind of the menu. One simple way to store small values in viewstate is to use a property instead of a member variable. net - Get The Cascading Dropdownlist To Work In A Gridview Edittemplate Fields? Asp. NET AJAX ComboBox. RemoveItemInList() function remove's the Selected ListItem from the DropDownList control. How to load the dropdownlist box without postback? eg: if you choose country in one dropdown the corresponding states wil fetch in another dropdo. NET Control (and retain state after postback mark up) - gist:1536344. DropDownList web control and place it inside the phControlHolder lose the values that the user has. It will automatically populate set of DropDownList controls without page postback. Net DropDownList will be referenced using JavaScript or jQuery on Client Side and then its SelectedIndexChanged event will be called by making use of the __doPostBack JavaScript function. get or set a value that indicate whether a postback to the server automatically occurs when the user changes the list selection. I need to retain its value in every postabck(. Hai all,I am face the problem with dropdownlist value inside gridview. Net DropDownList from getting Lost / Cleared / Reset on PostBack when the Submit button is clicked. Since your issue is related to APS. Please help me. Inside page load event i first checked whether it is postback, if yes then i am setting the value attribute of textbox with the value of password textbox. Forum Thread - DateTimePicker lose date value after postback - ASP. Any suggestions. I am setting the DataValueField property of the ddl that I populate at runtime and. 5 and have the following problem: My database has to keep track of doctoral students' extra-curricular activities. NET controls like DropDown, Gridview etc. Instead of this you can use CheckBox. Steve's solution involves the addition of a simple server control in the Web Form, a technique that works in a myriad of browsers. On selection of country i have populated its states using selectedindexchanged event of ddlCountry. I have a complex datagrid containing several ASP. hello, I want to ask how to keep the value selected in the dropdown list (within a search filter) when I navigate in the pages of the search results (using the pager), because I am losing the filte. Retain the state of dynamic created controls or maintain the data of dynamic created/ added user control on postback in asp. One of the elements is a checkboxlist. I am setting the DataValueField property of the ddl that I populate at runtime and. NET controls like DropDown, Gridview etc. The CascadingDropDown control in the AJAX Control Toolkit extends a DropDownList control so that changes in one DropDownList loads associated values in another DropDownList. A postback is an HTTP POST to the same page that the form is on. The drop down choices are given in SharePoint, so that is where the options are coming from. Another thing I ran into If you're using an ASP. please help to achive the requirement. # re: jQuery "Auto Post-back" Select/Drop-Down List Good point. This article will explain you how you can Bind DropDownList In MVC WebGrid and Retrive Value Using Asp. Following is my Contro, ID #3816411. if javascript adds a new value, when the postback is processed on the server, the server side DropDownList has no matching item to select. DropDownList Within Composite Control Is Losing Selected Value On Postback Feb 23, 2010 I am building a composite server control that currently only has a TextBox and a DropDownList. Join a community of over 2. Because on postback control will be reinitialized and the datasource will not be set if it is bind page load event when postback is false. DropDownList, it's name property is the same as your model's property name, you pass a SelectList with you selected value, but in the UI it's not showing your expected selection. AJAX TabContainer - losing ListBox data on postback. Join a community of over 2. i'm using a code in asp. I am looping through the products and creating select options from them i. DropDownList Values getting cleared after PostBack in ASP. I am populating a dropdownlist based on the selection from another dorpdownlist. NET Control (and retain state after postback mark up) - gist:1536344. by Christian Wenz. (in the rendered source). Retain Dropdown Selected Value After Postback Javascript. 6m developers to have your questions answered on Dynamically created combo box losing value after multiple postbacks of UI for ASP. After the great custom drop-down list styles made by Hugo in his tutorial Custom Drop-Down List Styling, we wanted to make it simple to create a custom structure from a normal select input (without multiple option selection). To remove the flicker from the page, I placed my drop down list in an update panel, but now it does not postback. SelectedValue; you will get the value that is currently selected. BSP view losing selected value from dropdown list box the information or the structure and field have nothing to do in your code and that´s why you lose the value. Use Popup To Postback/Update It’s Parent/Opener Without losing ViewState Values And Close JIT (Just In Time) Debugger with Visual Studio. DropDownList Within Composite Control Is Losing Selected Value On Postback Feb 23, 2010 I am building a composite server control that currently only has a TextBox and a DropDownList. Another gentleman asked me that how can he export the complete GridView to Excel sheet which has paging enabled. On clicking save button, the page is getting posted back and gridview values are getting cleared, due to which i am not able to save the latest data. Hello: I am currently using WebDataGrid version 10. The ASPxDropDownEdit's Text property stores a list containing selected items (that is, values of their Text property), separated by semicolons. keep the value of a dropdown after postback. Description: One of the common annoying problem that developer face while creating Asp. Hi all, I have a very simple user control that contains 3 drop downs. net controls like TextBox, RadioButtonList, DropDownList, CheckBoxes through JavaScript. For the demo, you can use the Employee Details table, which I have created before. I have a ASP DropDownList that gets populated on the Page_Load event, after i select an item and hit a button the selected item gets cleared and the first item in the DropDownList gets selected. NET Forums on Bytes. Making Postback or AJAX Request on Client Row Click. Dynamic Controls Lost On Postback. On selection of country i have populated its states using selectedindexchanged event of ddlCountry. Problem with dropdownlist in a webpart You also need to set them on every postback. Retain / maintain / preserve State (values) of dynamically created controls on PostBack in ASP. Using Auto-Postback with CascadingDropDown (C#) 06/02/2008; 2 minutes to read +1; In this article. This page provides solutions to common issues you may encounter while working with Telerik UI for ASP. hello, I want to ask how to keep the value selected in the dropdown list (within a search filter) when I navigate in the pages of the search results (using the pager), because I am losing the filte. I also used Updatepanel but after that the action what I want its not happening. I assign the datasource on every postback but i only do a databind when the page loads for the first time. For example, storing an Integer in viewstate can be accomplished like this: VB. ASPxComboBox may lose its selected value after a postback in the following situation: - You have non-unique ValueField values; - You have not defined a correct ASPxComboBox. The dropdown list populates with the relevant values and I am able to select a particluar item from the dropdown list without any postback issues etc, I am also able to grab the selected value when doing a postback or where I have some javascript/ajax function that is trying to workout if the user has selected something. NET Building Controls. Download Code or Download PDF. Select the value of asp:DropDownList Selected Item (VB. Rate this: dropdownlist losing value on postback. Set Selected Value for DropdownList on Clientside using Javascript May 29, 2010 collecteddotnet 3 Comments Sometimes we need show the dropdownlist control with some selected value after some activity ( without server postback ) on the web page. Posted by Sharpcnet under ASP. By default behavior of Syncfusion DropDownList, if DataSource is bound from code behind once on rendering the control. The way to detect postback in webpart is a little different especially if the webpart is not using IPostBackEventHandler. The ListItem class saves just its Text and Value property values in ViewState - it simply neglects its Attributes collection. Join a community of over 2. Here Mudassar Ahmed Khan has explained with an example, the difference between AutoPostBack True and AutoPostBack False in ASP. So if the 1st or 2nd Item is selected, you get Email1 and Email2 for. I have a dropdownlist in a grid header template - i have autopostback on but when i check the selectedindex in the page_load event (i have a routine which identifies the control that caused the postback and it determines the dropdownlist correctly) it is always 0 - i am NOT rebinding to the. Keeping in mind what we stated above, we know that we can recover the index, the value or text. In a page I have a link; clicking on it opens a dialog and sets a textbox value for that dialog. Dropdownlist control allows user to select only single item at a time. When there is a asp:DropDownList element with property AutoPostBack=true, a postback is triggered upon initializing the dropdown. DropDownList, it's name property is the same as your model's property name, you pass a SelectList with you selected value, but in the UI it's not showing your expected selection. But each postback clears any text field data input or selected. Form except CheckBoxList control. by Christian Wenz. I am trying to get the selected value of the dropdownlist. Event validation is enabled. After the great custom drop-down list styles made by Hugo in his tutorial Custom Drop-Down List Styling, we wanted to make it simple to create a custom structure from a normal select input (without multiple option selection). selectedindex or. Download Sample App or Download PDF. Join a community of over 2. DropdownList and i am populating it with data, but whenever postback occurs the selected value of the dropdown lost. The following sections explain how to get the values on the post back in these controls. Steve's solution involves the addition of a simple server control in the Web Form, a technique that works in a myriad of browsers. 1) Checked if the text box has the attribute called “Value” present. I'll have to admit, this is one of the only unfortunate nuances that I've come across in the ASP. But on form I have one DropDownList with AutoPostBack=true. 3) If the value is there I used jQuery datepicker API option called “setDate” to initialize the datepicker again with the value user entered. In other words, the contents of the form are POSTed back to the same URL as the form. This is a major problem when editing data as by default, the first value is selected and saving would mean the first value is used. Download Sample App or Download PDF. Do I use them when I'm updating a page 30-Jul-19 1. ddlState is in update panel. Retaining drop down list box value of a form after posting From a drop down list box or combo box visitor selects one option and submits the form. Any suggestions. Another postback occurs, the value is picked up and written to XML, no more problems. dropdownlistfor. Two dropdownlists are one is ddlcountry and another one is ddlstates. I want the user to be confirm whether they do indeed want to change the value, which on post back fires a server side event (selectedindexchanged). But in the postBack the selected values cannot be retrieved. The ID of the control, “DropDownList1,” is also passed to the _doPostBack function and stored in the _EVENTTARGET hidden field. also , the table structure that displays in the page is non exsistent in the jsp page. keep dropdownlist selected value after postback dropdownlist selected value after. Few days back one gentleman asked me that how can I select a row within a GridView control using CheckBox while the auto-postback property of the CheckBox is set to true. Here Mudassar Ahmed Khan has explained with an example, how to call SelectedIndexChanged event of ASP. On selection of country i have populated its states using selectedindexchanged event of ddlCountry. Event validation is enabled. NET User Control Not Retaining Postback Values. In a normal ASP. Retain / maintain / preserve State (values) of dynamically created controls on PostBack in ASP. ) The problem might be in the LoadPostData. But on form I have one DropDownList with AutoPostBack=true. When using the debugger it is very clear that on creation my ListItems are created as I want them. For example, storing an Integer in viewstate can be accomplished like this: VB. The SelectedIndexChanged the 1st DropDown is always called on postback and so it throws "populateDdl()" at every PostBack (if a value is selected). Hi, I have a dropdownlist in side a gridview, Onselectedindexchanged I want to some action. NET Forums on Bytes. selectedvalue properties in my coding, which are both very important. In other words, the contents of the form are POSTed back to the same URL as the form. Rilen Taylor matched with someone on a dating site, but the experience went sour when the match insisted Taylor identify as only one gender, either as a man or as a woman. Hi there, Need your help, i am a begginer - working with Java Stuidio Creator. Net DropDownList using JavaScript and jQuery. Tags: postback, repeater, viewstate trackback.