Select Case e.DataCol.name
    Case "型号","规格"
        Dim dr As DataRow = e.DataRow
        If dr.IsNull("型号") = False AndAlso dr.IsNull("规格") = False Then
            If e.DataTable.Compute("Count([_Identify])","型号 = \'" & dr("型号") & "\' And 规格 = \'" & dr("规格") & "\'") > 1 Then
                MessageBox.Show("已经存在相同型号和规格的行!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
                e.DataRow(e.DataCol.Name) = e.OldValue \'取消输入
            End If
        End If
End Select