Greetings,

I am developing a WHDG on a visual webpart on sharepoint 2010.  The datasource is set from a dataset at runtime.  I have created a child band and made a templatefield containing a  linkbutton  within the child band (At design time).  Everything works perfect, but when I expand the the rows, i am getting viewstate error.  This is due to the tempatefield in the child records are not rendered initially, but they will be rendered on demand. 

Hence I made to expand any one record at the page load so that one child record is rendered with this templated field (This is not the behavior what I wanted, but to check the issue). 

'To expand one row initially

 If Not Page.IsPostBack Then
            Dim rcount As Integer = Me.WebHierarchicalDataGrid1.GridView.Rows.Count
            For i As Integer = 0 To rcount - 1
                If Me.WebHierarchicalDataGrid1.GridView.Rows(i).IsEmptyParent = True Then
                    Me.WebHierarchicalDataGrid1.GridView.Rows(i).Expanded = True
                    Me.WebHierarchicalDataGrid1.GridView.Rows(i).ExpandChildren()
                    Exit For
                End If
            Next
        End If

Now there is no view state error and i can expand any row without problem.  But how can I work if i don't pre-expand one row at the page load?  Anyone can help me on this issue?

Thanks,

Rajesh