i am trying to access CheckBox in headertemplate of datagrid, soon after binding data to the grid in the pageindexchanged event.

i get a NullReferenceException when i do that. Could not find the reason. i have already done this accessing of header control elsewhere in my application, but have not had any problem before. Is it any thing to do with the pageindexchanged event.

i access the header control using

((CheckBox)header.FindControl("_selectAllChkBx")).Checked = Convert.ToBoolean(_isAllSelected.Value);

i have done the same in the _selectAllChkBx onCheckedChange Event.

Please help.

it is not a grid view, it is a datagrid. Datagrid does not have a property called HeaderRow. I sorted out the issue by fetching the header control using Datagrid.Controls[0].Controls[1].

What i am not able to understand is, in CheckedChange event of control in itemtemplate of the datagrid i fetched using Datagrid.Controls[0].Controls[0], whereas in pageIndexChanged event i fetched it as Datagrid.Controls[0].Controls[1]. what is the difference. how does grid structure differ in the above two cases. wierd....

 MyCheckBox = (CheckBox)DataGrid1.Items(0).FindControl("CheckBox1");

For further detail.

 http://66.129.67.4/p/1230647/2229994.aspx#2229994
 

DataGrid1.Items(0) will return the first item row and will not return the header row.

Hi anupreethi2001 ,

Try this way:

Table childtable = dg.Controls[0] as Table;

CheckBox chk = childtable.Rows[0].FindControl("idhere") as CheckBox;