Get selected values of checkbox from GridView in ASP.NET

   Private Function SelectedValues() As String
        Dim strValues As String = ""
        For i As Integer = 0 To GridView.Rows.Count - 1
            Dim chkSelect As CheckBox
            chkSelect = CType(gvClientContact.Rows(i).FindControl("chkSelect"), CheckBox)
            If Not chkSelect Is Nothing Then
                If chkSelect.Checked Then
                    strValues &= CStr(GridView.DataKeys(i).Values(0)) & ","
                End If
            End If10/09/2010
        Next
        Return strValues.Trim(CChar(","))
    End Function