Searching SQL Db And Returning Results To Gridview


I am in the process of building a search function for an application (VS2005,, VB code, and AJAX functionality).The user's form has a textbox (for an input string) and two drop-downs.  The user would then click on a "Search Now" button, and the data should populate
in a Gridview to the left of the search form.  I'm trying to search over an SQL database and need to know how to exactly implement what I have so far:

<div id="mcb" style="background-color:#2e4b5b; width:195px; height:410px; float:left">
     <div id="ht" style="background-color:#1b2c36;padding:10px; border-bottom:solid 1px #fffdff; width:175px;float:left;">
           Quick Search
<div style="clear:both;"></div>

<div style="padding:10px; background-color:#2e4b5b">
      <div id="tfta" style="padding:5px 0px 0px 0px">
                <b>Vendor Name</b>
                <asp:TextBox ID="txtVendorFilter" runat="server"></asp:TextBox>
                <div style="font-size:1px; width:150px; height:1px; background-color:#8FA71F"></div><br />
                 <b>Contract Type:</b>
                 <asp:dropdownlist ID="ddlContractTypeSearch" runat="server" Width="155px">
                           <asp:ListItem Value="0">Select...</asp:ListItem>
                           <asp:ListItem Value="1">Vendor Maintenance</asp:ListItem>
                           <asp:ListItem Value="2">Consulting Contract</asp:ListItem>
                           <asp:ListItem Value="3">Hardware License</asp:ListItem>
                           <asp:ListItem Value="4">Software License</asp:ListItem>
                           <asp:ListItem Value="5">Statement of Work</asp:ListItem>
                           <asp:ListItem Value="6">Admin Svcs. Agreement</asp:ListItem>
                           <asp:ListItem Value="7">Master Service Agreement</asp:ListItem>

           <div style="font-size:1px; width:150px; height:1px; background-color:#8FA71F"></div><br />
                   <b>Sort By:</b>
                   <asp:DropDownList ID="ddlSortBy" runat="server" Width="155px">
                          <asp:ListItem Value="0">Select...</asp:ListItem>
                          <asp:ListItem Value="1">Contract Name</asp:ListItem>
                          <asp:ListItem Value="2">Contract Type</asp:ListItem>
                    </asp:DropDownList>             <div style="font-size:1px; width:150px; height:1px; background-color:#8FA71F"></div><br />
    <br />
    <asp:Button ID="btnUpdateFilter" runat="server" Text="Search" width="120px"/>
    <asp:Button ID="btnReset" runat="server" Text="Reset" /></div>


 Here's my select statement used to initially populate the Gridview (set up using the configuration of the Gridview):
SELECT [ContractID], [ContractName], [ContractType], [EffectiveDate], [TerminationDate] FROM [Contract]
Here's my btnUpdateFilter codebehind (VB):

Protected Sub btnUpdateFilter_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdateFilter.Click
     Dim strVendorName As String
     Dim strContractType As String
     Dim strSortBy As String

     If txtVendorFilter IsNot "" Then
           strVendorName = txtVendorFilter.Text
     End If

If ddlContractTypeSearch.SelectedValue = 1 Then
      strContractType = "1"
ElseIf ddlContractTypeSearch.SelectedValue = 2 Then
      strContractType = "2"
ElseIf ddlContractTypeSearch.SelectedValue = 3 Then
      strContractType = "3"
ElseIf ddlContractTypeSearch.SelectedValue = 4 Then
      strContractType = "4"
ElseIf ddlContractTypeSearch.SelectedValue = 5 Then
      strContractType = "5"
ElseIf ddlContractTypeSearch.SelectedValue = 6 Then
      strContractType = "6"
ElseIf ddlContractTypeSearch.SelectedValue = 7 Then
      strContractType = "7"
      strContractType = "0"
End If

If ddlSortBy.SelectedValue = 1 Then
     strSortBy = "ContractName"
ElseIf ddlSortBy.SelectedValue = 2 Then
     strSortBy = "ContractType"
     strSortBy = "ContractName"
End If

End Sub


My question is, "how can I form the proper SQL statement", and then implement it so that my gridview will populate using my generated SQL Statement?

Thank you for the help!!!


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FROM tbl_Project P, tbl_ProjectManager M, tbl_ProjectStatus S
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Result is I get a single record which shows the qty ordered (from the order details tbl), and the total received (from the received qty) tbl

These are held in a seperate tbl as an order can be deliveryed in several stages.

Here is my statement:

SELECT PDS_Login.Supplier_Products.ProductName, PDS_Login.Supplier_Products.ProductCode, dbo.Suppliers_POs_Details.POID,
dbo.Suppliers_POs_Details.PODetailsID, dbo.Suppliers_POs_Details.Qty, dbo.Suppliers_POs_Details.PricePerItem,
dbo.Suppliers_POs_Details.PoDetailsStatus, dbo.Suppliers_POs_Details.PoDateExpected, dbo.Suppliers_POs_Details.PODateReceived,
SUM(dbo.Suppliers_POs_Details.Qty * dbo.Suppliers_POs_Details.PricePerItem) AS LineTotal, SUM(dbo.Suppliers_POs_Details_Received.Qty)
AS QtyReceived
FROM dbo.Suppliers_POs_Details INNER JOIN
PDS_Login.Supplier_Products ON dbo.Suppliers_POs_Details.ProductID = PDS_Login.Supplier_Products.ProductID LEFT OUTER JOIN
dbo.Suppliers_POs_Details_Received ON dbo.Suppliers_POs_Details.PODetailsID = dbo.Suppliers_POs_Details_Received.PODetailsID
WHERE (dbo.Suppliers_POs_Details.POID = @POID)
GROUP BY dbo.Suppliers_POs_Details_Received.Qty, PDS_Login.Supplier_Products.ProductName, PDS_Login.Supplier_Products.ProductCode,
dbo.Suppliers_POs_Details.POID, dbo.Suppliers_POs_Details.PODetailsID, dbo.Suppliers_POs_Details.Qty, dbo.Suppliers_POs_Details.PricePerItem,
dbo.Suppliers_POs_Details.PoDetailsStatus, dbo.Suppliers_POs_Details.PoDateExpected, dbo.Suppliers_POs_Details.PODateReceived,

The problem is, if there is more than one relating record in teh Received Qty tbl instead of that being added together as I want, two results appear...

It's obviously something simple but I can't seem to figure it out - anyone point me in the right direction?

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