[عبدالله الدوسري]

كود :

   Private Sub DataGridView1_CellFormatting(sender As Object, e As DataGridViewCellFormattingEventArgs) Handles DataGridView1.CellFormatting
       If DataGridView1.Columns(e.ColumnIndex).Name = "Exp" AndAlso IsDBNull(e.Value) Then
           DataGridView1.Rows(e.RowIndex).DefaultCellStyle.BackColor = Color.Red
       End If
   End Sub