title: Column Name already belongs to datatable
body: <p>I try to copy from one gridview to another gridview 
  i try this </p>
  
  <pre><code> Dim dt As New DataTable()
  
      For Each cell As TableCell In GridView1.HeaderRow.Cells
          dt.Columns.Add(cell.Text)
      Next
  
      For Each row As GridViewRow In GridView1.Rows
          dt.Rows.Add()
          For i As Integer = 0 To row.Cells.Count - 1
              dt.Rows(row.RowIndex)(i) = row.Cells(i).Text
  
          Next
      Next
  
      GridView2.DataSource = dt
      GridView2.DataBind()
  </code></pre>
  
  <p>but this shows an error </p>
  
  <pre><code>A column named 'Amount' already belongs to this DataTable.
  </code></pre>
  
  <p>where as i SP i don't have duplicate columns </p>