If e.Row.RowType = DataControlRowType.Header Then
Dim cell As TableCell = e.Row.Cells(1)
cell.Width = New Unit(200) 'I added "200px" instead of 200. But it didn't work.
cell.text = "abc" 'This is working. It is show the header as abc
in above code i added (as an experiment) cell.wrap = false and cell.wrap = true. that code also not effected. There is no any error. But width doesnt work.