finding from code-behind some object in gridview

Valerie Meunier

There is a gridview with a hiddenfield and a dropdownlist in templates. I have to find them from code-behind. I have the solution but don't understand everything.

1) from event GridView1_RowDataBound: why does this not work: sv = sender.FindControl("HiddenField1") ?

2) from event d2_SelectedIndexChanged: why do I have to use 'sender' here like dd2 = sender.FindControl("HiddenField1") and not simply dd2 = FindControl("HiddenField1") ?

'Sender' refers to the object which raised the event, but this is as if 'HiddenField1' was inside the dropdownlist.

Thanks

-----
Friend sv As HiddenField
Friend dd2 As DropDownList

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
sv = e.Row.FindControl("HiddenField1")
dd2 = e.Row.FindControl("dd2")
...

Protected Sub dd2_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
sv = sender.FindControl("HiddenField1")
dd2 = sender.FindControl("dd2")
End Sub

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Valerie Meunier4y ago
Thanks for replying, but i suggest to read carefully my questions. As i mentioned, i know the solution. I only want to have some explanation about it.
Jignesh Kumar4y ago
Hi,

Please check below one,
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
           if (e.Row.RowType == DataControlRowType.DataRow)
           {
               HiddenField hf1 = e.Row.FindControl("HiddenField1") as HiddenField;
               if(hf1 != null)
               {
                 string hiddenfieldValue =  hf1.Value ;
                }
           }
}