title: convert string to boolean
body: <p>I got a datagridview which transfers data to a other datagridview which i would like some help with. It looks like it should be working, however i get a error saying that the string cannot be converted to boolean. This is the case for the checkbox in the datagridview(user has to click the checkboxes of the rows they want to copy.) 
  I know how to convert values to strings etc but i can't seem to get this one figured out. Can anyone help me? 
  This is what happens at the click of the copy button:</p>
  
  <pre><code>For i As Integer = 0 To DGV1.Rows.Count - 1
          If DGV1.Rows(i).Cells(4).Value = True Then
              DGV2.Rows.Add(DGV1.Rows(i).Cells(3).Value, _
              DGV1.Rows(i).Cells(2).Value, _
              DGV1.Rows(i).Cells(3).Value, _
              DGV1.Rows(i).Cells(4).Value, _
              DGV1.Rows(i).Cells(6).Value)
              '2 = voer, 3 =voerid, 4= drogestof, 6 = (voer)keukenlocatie
          End If
  </code></pre>
  
  <p>DGV1 is the datagrid where the data has to come from, so cell4 is the checkbox. DGV2 is the datagrid where the data has to go to. </p>
  
  <p>Update: 
  Right now i use this code, which got me a bit further. </p>
  
  <pre><code>  Private Sub Button1_Click_2(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkopieren.Click
      For i As Integer = 0 To DGV1.Rows.Count - 1
          If CBool(DGV1.Rows(i).Cells(4).Value) Then
              'If DGV1.Rows(i).Cells(4).Value = True Then
              DGV2.Rows.Add(DGV1.Rows(i).Cells(0).Value, _
              DGV1.Rows(i).Cells(1).Value, _
              DGV1.Rows(i).Cells(2).Value, _
              DGV1.Rows(i).Cells(3).Value)
              '2 = voer, 3 =voerid, 4= drogestof, 6 = (voer)keukenlocatie
          End If
      Next
  
  End Sub
  </code></pre>
  
  <p>I get the error "<strong>Invalid Operationexception was unhandled</strong>"
  Apparantly, they don't like it when i want to transfer the selected data from 1 datagridview to a other bound datagridview. Is there any solution for this? I tried fixing it myself and googling, but without results. </p>