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DataGridView1.EnableHeadersVisualStyles = False
DataGridView1.Columns(1).HeaderCell.Style.BackColor = Color.Red
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For intCol As Integer = 0 To DataGridView1.Columns.Count - 1
Dim strColName As String = DataGridView1.Columns(intCol).Name
Dim values = From row In mdt.AsEnumerable() Select row.Field(Of Object)(strColName) Distinct
If values.Count() > 1 Then
DataGridView1.Columns(intCol).HeaderCell.Style.BackColor = Color.Red
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Dim mdt as DataTable
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