[vb.net] ดึงข้อมูลจาก access มาแล้วตัวเลข0กลางเปนค่าว่าง

 Dim sql_search As String
        Dim search As String
        Dim search2 As String
        search = CBContractor.Text
        search2 = TXTItem.Text
        Dim num As Integer
        If search = "ALL " Then
            If search2 = "" Then
                num = 0
            Else
                num = 2
            End If
        Else

            If search = "" Then
                If search2 = "" Then
                    num = 0
                Else
                    num = 1
                End If
            Else
                If search2 = "" Then
                    num = 2
                Else
                    num = 3
                End If
            End If
        End If

        '  sql_search = " SELECT        IT_PlannedList.PlannedListID, IT_Description.Item_Desc AS Item, IT_PlannedList.Remark, Contractor.Contractor_Name AS CT, IT_PlannedList.OrderedTimes, IT_PlannedList.Qty,SUM(IT_TransContractor.ReceivedQty) as RecQty ,  IT_PlannedList.Qty - sum(IT_TransContractor.ReceivedQty) AS [Awaiting Qty], IT_PlannedList.Unit FROM    (((Contractor INNER JOIN  IT_PlannedList ON Contractor.Contractor_ID = IT_PlannedList.ContractorID) INNER JOIN  IT_TransContractor ON IT_PlannedList.ItemNo = IT_TransContractor.ItemNo AND IT_PlannedList.ContractorID = IT_TransContractor.ContractorID AND  IT_PlannedList.OrderedTimes = IT_TransContractor.OrderedTimes) INNER JOIN  IT_Description ON IT_TransContractor.ItemNo = IT_Description.ItemNo)  "
        sql_search = " SELECT IT_PlannedList.PlannedListID, IT_PlannedList.ItemNo AS [Item No], IT_Description.Item_Desc AS Item, IT_PlannedList.ContractorID, Contractor.Contractor_Name AS CT, IT_PlannedList.OrderedTimes, IT_PlannedList.Qty, SUM([IT_TransContractor.ReceivedQty]) AS [Rec Qty], IT_PlannedList.Qty - Sum([IT_TransContractor.ReceivedQty]) AS [Awaiting Qty], IT_PlannedList.Unit, IT_TransContractor.ModelID, IT_PlannedList.DateCreated FROM Contractor INNER JOIN ((IT_Description INNER JOIN IT_PlannedList ON IT_Description.ItemNo = IT_PlannedList.ItemNo) LEFT JOIN IT_TransContractor ON (IT_PlannedList.ContractorID = IT_TransContractor.ContractorID) AND (IT_PlannedList.ItemNo = IT_TransContractor.ItemNo) AND (IT_PlannedList.PlannedListID = IT_TransContractor.PlannedListID)) ON Contractor.Contractor_ID = IT_PlannedList.ContractorID "

        Dim sqlWhere As String = ""
        Select Case num
            Case 0 : sqlWhere = ""


            Case 1 : sqlWhere = "where Item_Desc LIKE'" & search2 & "'"


            Case 2 : sqlWhere = "where Contractor_Name LIKE '" & search & "' "


            Case 3 : sqlWhere = "where Contractor_Name LIKE '" & search & "' and Item_Desc LIKE'" & search2 & "'"
        End Select
        Dim sqlemp As String

        Dim group As String = "GROUP BY IT_PlannedList.PlannedListID, IT_PlannedList.ItemNo, IT_Description.Item_Desc, IT_PlannedList.ContractorID, Contractor.Contractor_Name, IT_PlannedList.OrderedTimes, IT_PlannedList.Qty, IT_PlannedList.Unit, IT_TransContractor.ModelID, IT_PlannedList.DateCreated ORDER BY IT_PlannedList.ItemNo"


        sqlemp = sql_search & sqlWhere & group

        ' MessageBox.Show(num)






        da = New OleDbDataAdapter(sqlemp, conn)
        da.Fill(ds, "Contractor")

        If ds.Tables("Contractor").Rows.Count <> 0 Then


            With DataGridView1
                .ReadOnly = True
                .DataSource = ds.Tables("Contractor")
            End With
        Else

        End If

        '------------------------------- ตาราง -----------------------------------
        'Dim cs As New DataGridViewCellStyle()
        'cs.Font = New Font("Ms Sans Serif", 10, FontStyle.Bold)

        With DataGridView1

            '   .ColumnHeadersDefaultCellStyle = cs    'กำหนดข้อความแต่ละคอลัมน์
            .Columns(0).HeaderText = "PlannedListId"
            .Columns(1).HeaderText = "Item No"
            .Columns(2).HeaderText = "Item"
            .Columns(3).HeaderText = "ContractorID"
            .Columns(4).HeaderText = "CT"
            .Columns(5).HeaderText = "Ordertimes"
            .Columns(6).HeaderText = "Qty"
            .Columns(7).HeaderText = "RecQty"
            .Columns(8).HeaderText = "Awaiting Qty"
            .Columns(9).HeaderText = "Unit"
            .Columns(10).HeaderText = "ModelID"
            .Columns(11).HeaderText = "DateCreated"



            .Columns(0).Width = 100                 'กำหนดความกว้าง
            .Columns(1).Width = 210
            .Columns(2).Width = 210
            .Columns(2).Width = 210
            .Columns(3).Width = 75
            .Columns(4).Width = 75
            .Columns(5).Width = 50
            .Columns(6).Width = 50
            .Columns(7).Width = 50
            .Columns(8).Width = 50
            .Columns(9).Width = 50
            .Columns(10).Width = 50
            .Columns(11).Width = 50

        End With