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FindControl in GridView

Posted on 2006-07-21
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Last Modified: 2010-05-18
I have a DropDownList in the EditItemTemplate of a Gridview Column and need to retrieve its SelectedValue.  My code is throwing the
following error:  "Object reference not set to an instance of an object"

heres what I have:

 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        DropDownList ddl = new DropDownList();
        string str;
        ddl = (DropDownList)(GridView1.FindControl("DropDownList1"));
        str = ddl.SelectedValue.ToString();  // this line throws the error
}

See anything wrong here?  I'm banging my head!



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Question by:BoggyBayouBoy
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4 Comments
 
LVL 25

Accepted Solution

by:
DBAduck - Ben Miller earned 2000 total points
ID: 17158667
It is more about that you will not trap the SelectedIndexChanged event of the Dropdownlist because you are in an EditItemTemplate.

You will want to trap the EditItem event in the Gridview and then trap the GridViewEditEventHandler.

Details are here:
http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.gridviewediteventhandler.aspx

Then you can use the event args to find the right index and then do a FindControl like

DropDownList ddl = (DropDownList)GridView1.Rows[e.NewEditIndex].FindControl("DropDownList1");
get the ddl.SelectedValue.

Hope that makes sense!

Ben.
0
 
LVL 1

Author Comment

by:BoggyBayouBoy
ID: 17158673
I'll try that.  Thanks.  
0
 
LVL 2

Expert Comment

by:SKumar_1981
ID: 17158864
Try this

Dim grdCellData As DataGridItem
Dim ddl As System.Web.UI.WebControls.DropDownList
ddl = grdCellData.FindControl("ddl ")

regards,
skumar
0
 
LVL 1

Author Comment

by:BoggyBayouBoy
ID: 17162922
Thanks!
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