C# - Force ViewState Restoration After Child Controls Are Recreated?
Dec 21, 2010
Consider I have 2 controls, C and CompositeC which contains C. Both C and CompositeC have ViewState.
Now consider a third control causes a postback.
The resulting life cycle will be as follow:
CompositeC tries to restore state. To do so it needs to create the child controls, so it creates C.
When C is created it's ViewState is restored.The third control's postback event is triggered. At this time a handler calls CompositeC.RecreatedChildControls() and C is created again.Everything renders.
The problem is that C state is not restored again after step 3. RecreateChildControls method should modify the control's state so that when C is reintroduced to the CompositeC control's collection it's viewstate is automatically restored but it doesn't.
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May 4, 2010
I have a FormView with an EditTemplate.And the EditTemplate contains an ascx control:
<asp:FormView
ID="fvTicketUpdate"
runat="server"
[code]...
The contents of the ascx control has TextBox and DropDownList controls binding to the results of the FormView's ObjectDataSource through Text='<%# Eval("field1") %>'and SelectedValue='<%# Eval("field2") %>'.This works fine and I have been building all of my front end pieces like this as <asp:Panels> rendering as FieldSets that go 100% across the screen.And we call these areas "strips" accross the screen.But now I've run into a problem.One TextBox and one DropDown bind fine to a Ticket Object.But the DropDownList that works has its <asp:ListItems> hardcoded before hand.Now I have DropDownList that gets populated through a WebService in the ascx's
code behind like this:
public partial class UserControls_FormControls_PntipUpdtFaaInfo :
System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
[code]...
The Problem I think is the FormView is trying to do its Bind to the objectDataSource before its child ascx control is loaded in the Edit Template.And I am getting this error:
Databinding methods such as Eval(),XPath(),and Bind() can only be used in the context of a databound control.Meaning that the control must already be databound to bind the selectedValue to a Property of the TicketObject.Is there an easy way to force the order of loading to make the PntipUpdtFaaInfo control load and have its Page_Load execute and bind ddlEquip before the FormView does its first dataBind and executing its Evals?Otherwise I have to take out the eval on the ddlEquip SelectedValue attribute and go to the Parent Page and hack and force everything to happen when it needs to.This layout has worked out well for me.All of the ascx area strips across the screen share the same Validation Summary for example.It allows me to think about one section at a time and the Properties to the Business Obect and CRUD methods as I go.But this is a big brick wall I've hit.
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Jul 19, 2010
I have an ASP.Net site that has master pages. The master page has some calls to functions to get information from a database. Then in one of the parts of the master page I have form that modifies that information. So when the user clicks a button the information in the database is updated but the display of that information doesn't update until the page is refreshed or another link is followed.
I would like to know how to force a page to refresh without loosing VIEWSTATE information so that the newly updated data in the database will appear correctly on the screen.
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Mar 3, 2010
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I read the fantastic blog post TRULY Understanding ViewState and it answers my question in 4. Initializing child controls programmatically. However, the article's solutions are less-than-ideal: create child controls dynamically (I'm not and can't -- too much existing code), use a 3rd party CodeExpressionBuilder (would much prefer this was in code-behind), and use OnPreInit (which "doesn't help you what-so-ever if you are developing a CONTROL").
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Jun 30, 2010
I have a problem regarding to asp.net lifecylce hierarchy.
Basically, I have one user control which has a GridView in it. And this GridView is dynamically generated based on a public property on the control (named Parameter in the simplified code below).
Everything is fine when I insert this control in an aspx page, set its Parameter property and call DataBind(Parameter) on it. GridView is generated and populated on the UI.
Problem occurs when I post-back the page. I have to regenerate the GridView structure so that the data in the ViewState of the control can be used to populate the GridView. So that I can achieve its content. But as long as the GridView structure is generated dynamically and it is based on the Parameter property set on it, this is not possible. Because the OnInit of the user control is called before the OnInit of the page and that is why the Parameter property is set after the generation of the GridView structure. As a result I get an empty Gridview in the end.
Here is the code in a simplified way.
Can you give me some recommendation how to overcome this?
Can I explicitly force asp.NET to re-load the ViewState of a gridview?
[code]....
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May 3, 2010
My ASP.NET form contains a collection of dynamically-created radiobuttons that are created and configured in the Page_Load event handler.
Normally, I process postback data in the Page_Load handler, using the condition:
if (IsPostBack)
However, since the controls that I need to access are created IN the Page_Load handler, the postback data from the previous rendering of the page is lost. To better illustrate the problem, here is an outline of the events as they occur:
1-Page_Load is invoked for the first time
2-An unknown number of radiobuttons are created dynamically
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7-The radio-buttons are added dynamically, exactly as before
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It seems like I need to be processing different parts of this in different event handlers. Is there an event that occurs after postback, but while the original radiobuttons are still accessible?
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Oct 9, 2010
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Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:
[Code]....
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Jan 11, 2011
I have problem getting values from viewstate in GetTopThemes.
<asp:ObjectDataSource
ID="sourceGetTopThemes"
runat="server"
TypeName="DBConnection"
SelectMethod="GetTopThemes"
EnableViewState="true"></asp:ObjectDataSource>
[Code]....
}
[Code]....
when the page is not Posted back, I saved all values in the viewstate.
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Apr 30, 2010
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Does the master page have its own viewstate? Would I be able to make sure none of items on my master page are using the viewstate?
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Sep 24, 2010
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Jan 24, 2016
I have designed a collapsible nested gridview project using this article as a reference Collapsible Nested GridView with Paging using ASP.Net. I am trying to modify the code to collapse a gridview when another gridview is expanded so that only one nested gridview will be open at a time.
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Jul 2, 2010
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Aug 6, 2012
I want to do one thing that when i edit the gridview then it will not go back to main form for editing.it will remain there in the form for the row editable.
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[CODE] ...
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Apr 20, 2010
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Apr 14, 2010
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Feb 18, 2010
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Mar 29, 2010
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<ItemTemplate>
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<tr>
[code]...
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Aug 29, 2011
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Feb 18, 2010
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Jul 17, 2015
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Mar 6, 2010
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[code]....
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Apr 16, 2010
lately I'm using less and less the ASP.NET controls and also turns off the viewstate in almost any page, in my opinion its easier to maintain your pages, you get more control over what happening and most importantly it gives a serious performance boost to large pages (no view state). I'm also using a lot of ajax in my projects (without the script manager / updatecontrol but via javascript) is anyone here working like this? is this bad practice ?
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May 13, 2010
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Basically on a page postback, the ViewState for the custom controls in the gridview are being 'lost'. This is a problem as I have a Sort Direction field that toggles between Asc and Desc, and I rely heavily on the ViewState to remember the last value. Does anyone know what I might be doing wrong here? Or how I could change my code to keep the ViewState.
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Mar 8, 2010
When you create an ASP.NET page with no controls and runs it, a view state hidden field is added.
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My question is - what is this number?
P.S. I guess this value appears on every page, with or without controls.
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