[VB.NET] อยากเช็คค่าซ้ำที่หน้า Datagridview ให้ค่าที่ไม่ซ้ำเท่านั้น บันทึกลงใน Database ต้องทำยังไงค่ะ?

        Dim sqlC As String = ""
        Dim DT As New DataTable
        Dim sendStatus As Integer

        sqlC = "Select c.* "
        sqlC &= "FROM Clother c 
        sqlC &= "WHERE c.No=" & tClother
        DT = FShowData(sqlItem)

        If DT.Rows.Count > 0 Then
            For i As Integer = 0 To DgvItem.Rows.Count - 1
                If DgvItem.Rows(i).Cells(0).Value <> DT.Rows(i).Item("Code") Then
                    sendStatus = FuncInsert(CStr(DgvItem.Rows(i).Cells(0).Value))
                End If
            Next
        End If

Dim sqlC As String = ""
            Dim DT As New DataTable
            Dim sendStatus As Integer
    
            sqlC = "Select c.* "
            sqlC &= "FROM Clother c 
            sqlC &= "WHERE c.No=" & tClother
            DT = FShowData(sqlItem)
            
    If DgvItem.Rows.Count > 0 Then
                For i As Integer = 0 To DgvItem.Rows.Count - 1
                    If (CStr(DgvItem.Rows(i).Cells("Code").Value) <> "") Then
                        Dim dr As DataGridViewRow
                        dr = DgvItem.Rows(i)
                        DT.TableName = "Code"
                        If DT.Rows.Count > 0 Then
                            For j As Integer = 0 To DT.Rows.Count - 1
                                If CStr(DgvItem.Rows(i).Cells("Code").Value) <> CStr(DT.Rows(j).Item("Code")) Then
                                    sendStatus = FuncInsert(CStr(DgvItem.Rows(i).Cells(0).Value))
                                End If
                            Next
                        End If
    
                        DT.Rows.Add(dr.Cells("Code").Value).ToString() >> Error Line: Value was either too large or too small for an Int32.Couldn't store <130027646001> in No Column.  Expected type is Int32.
    
                    End If
                Next
            End If
            DT.Dispose()
            DT = Nothing