why is ddl.selectedValue not retained in viewstate ?

[Guest]

I try to move textBoxes and ddl dynamically to a ASP:table and everything
works correctly, except that for the ddl's the selectedValue is not retained
(it is for the TextBoxes).
Here is my code:
private void LoadTable()
{
Table1.Rows.Clear();
TableRow r = new TableRow();
TableCell c = new TableCell();
c.Controls.Add(Page.FindControl("TextBox1"));
TextBox1.Visible = true;
c.Controls.Add(Page.FindControl("DropDownList1"));
DropDownList1.Visible = true;
if (tbxHidden.Text == "")
{
DropDownList1.Items.Clear();
DropDownList1.Items.Add("Value1");
DropDownList1.Items.Add("Value2");
DropDownList1.Items.Add("Value3");
}
r.Cells.Add(c);
Table1.Rows.Add(r);
TableDummy.Rows.Clear();
tbxHidden.Text = "IsLoaded";
TableCell cd= new TableCell();
TableRow rd = new TableRow();
cd.Controls.Add(Page.FindControl("tbxHidden"));
rd.Cells.Add(cd);
TableDummy.Rows.Add(rd);
}

Is this a bug ?

 

[Peter Rilling]

You have to populate the list in the Init event. The viewstate is processed
between the Init and Load.

 

[Guest]

Thanks a lot Peter, this is exactly what I needed.

 

[JIMCO Software]

You have to populate the list in the Init event. The viewstate is
processed between the Init and Load.

That's true in part. The part of the lifecycle that is responsible for
maintaining this is the LoadPostData() method of the IPostBackDataHandler
interface. Any control that posts form data (textbox, checkbox, ddl, etc.)
implements IPostBackDataHandler and uses the LoadPostData() method to
maintain state between postbacks.

In other words, this has nothing to do with viewstate. Turn off viewstate
and you will still persist your values via IPostBackDataHandler.

--
Jim Cheshire
JIMCO Software
http://www.jimcosoftware.com

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