dynamic columns disappears after postback

Question

I have a GridView with some BoundFields and two TemplateFields. In these two TemplateFields, I dynamically create UserControls containing a DropDownList and a TextBox, which users can modify.

When I try to get the values of the controls after a PostBack, the values in BoundFields are still there but my dynamic controls disappears. I can create them again but it won't get the user's values... How can I get these values before they're lost?

Here's some of my code:

In the RowDataBound event:

Select Case type
    Case "BooleanBis"
        e.Row.Cells(2).Controls.Clear()
        Dim list1 As BooleanBisList = New BooleanBisList(avant, False)
        e.Row.Cells(2).Controls.Add(list1)

        e.Row.Cells(4).Controls.Clear()
        Dim list2 As BooleanBisList = New BooleanBisList(apres, True)
        e.Row.Cells(4).Controls.Add(list2)
    Case "Boolean"
        e.Row.Cells(2).Controls.Clear()
        Dim list3 As BooleanList = New BooleanList(avant, False)
        e.Row.Cells(2).Controls.Add(list3)

        e.Row.Cells(4).Controls.Clear()
        Dim list4 As BooleanList = New BooleanList(apres, True)
        e.Row.Cells(4).Controls.Add(list4)
End Select

In my button click event, I try to get the user control :

Case "String"
    temp.ChampValeurApres = DirectCast(Tableau1.Rows(i).Cells(selectedColumn).Controls(1), TextBox).Text

but i get the error that it doesn't exist.

score 8 · Accepted Answer · answered Oct 05 '11 at 07:39

8

You should create dynamic controls in RowCreated instead of RowDataBound because this event gets fired on every postback whereas RowDataBound only will fire when the GridView gets databound to it's DataSource.

Dynamically created controls must be recreated on every postback with the same ID as before, then they retain their values in the ViewState and events will fire correctly(f.e. a DropDownList's SelectedIndexChanged event).

So you should create them in RowCreated and "fill" them in RowDataBound(f.e. the DropDownList datasource/Items or a TextBox-Text).

answered Oct 05 '11 at 07:39

Tim Schmelter

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Thank you very much ! i still have a problem, i have column with readonly controls. and the value of these controls is not retrieved after the postback. any idea ? – user874854 Oct 05 '11 at 09:53
@user874854: `readonly` controls does not maintain changes on clientside in the ViewState(only changes on serverside). Make them `readonly` via [Attributes](http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.webcontrol.attributes.aspx)-collection, for example: `TextBox1.Attributes.Add("readonly","readonly");`. On this way you fool ASP.NET. Look [here](http://www.codeproject.com/KB/aspnet/Readonly.aspx) for further infos. – Tim Schmelter Oct 05 '11 at 10:23

score 0 · Answer 2 · edited Jan 19 '14 at 12:29

0

I had been using:

EnableViewState="false"

in the GridView attributes. Removing it solved my problem!

edited Jan 19 '14 at 12:29

TLama

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answered Jan 19 '14 at 12:05

SRK

11

score 0 · Answer 3 · edited Jul 20 '19 at 04:42

0

I just did

protected void Page_Load(object sender, EventArgs e)
{
    if (!(Page.IsPostBack))
    {
        // Put the selected items which u want to keep on postback
    }
    else
    {
        //regenerate auto created controls
    }
}

and it worked as well

edited Jul 20 '19 at 04:42

joanis

10,635
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answered Jul 20 '19 at 00:06

Özgür ERDEN

1

dynamic columns disappears after postback

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