default row selected

[Gene]

I have a Radgrid with a GridClientSelectColumn.  I need to default the header and all row checkboxes to checked = true. 

Thanks in advance.

[Princy]

Hello ,

You can access the client id of the header checkbox from code behind and store in a HiddenField. Then you can use the following code in the onGridCreated client event of the grid, to check all the row checkboxes and the header checkbox by default:
c#:

 protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridHeaderItem)
        {
            GridHeaderItem header = (GridHeaderItem)e.Item;
            string clientid = ((CheckBox)header["ClientSelectColumnUniqueName"].Controls[0]).ClientID;
            HiddenField1.Value = clientid;
        }
    }

js:

  function GridCreated()
    {
       var grid = $find("<%=RadGrid1.ClientID %>");
       grid.MasterTableView.selectAllItems();
       var hiddenfield = document.getElementById("HiddenField1");
       var control = document.getElementById(hiddenfield.value);
       control.checked = true;
    }

Hope this helps..
Princy.