Question

I would like my gridview to be filtered by the dropdown list I have. It is pulling specific information from the database, so when you choose a value from the dropdown list, it should search through all the records and find only records with the ddl value in them.

The code that I am using in the codebehind for the SelectedIndexChanged is not right though. I get an error message saying 'Value' is not a member of 'Integer'. This is on the line dsCompanyFilter.SelectParameters.Add

It probably has something to do with the gridview not tying to the dropdown list properly, but I am not sure how to fix that code. Please help!

  <asp:Content ID="Content2" ContentPlaceHolderID="body" Runat="Server"><br /><br /><br />
<asp:linkbutton id="btnAll" runat="server" text="ALL" onclick="btnAll_Click" />
<asp:repeater id="rptLetters" runat="server" datasourceid="dsLetters">
<headertemplate>
 |
</headertemplate>
<itemtemplate>
 <asp:linkbutton id="btnLetter" runat="server" onclick="btnLetter_Click" 
 text='<%#Eval("Letter")%>' />
 </itemtemplate>

<separatortemplate>
 |
</separatortemplate>
</asp:repeater>

<asp:sqldatasource id="dsLetters" runat="server" connectionstring="<%$ 
 ConnectionStrings:ProductsConnectionString %>"
 selectcommand="SELECT DISTINCT LEFT(ProductName, 1) AS [Letter] FROM [Product]">
</asp:sqldatasource>

Filter By Company:<asp:DropDownList ID="ddlCompany" runat="server" 
DataSourceID="dsCompanyFilter"  DataTextField="CompanyName" DataValueField="CompanyID">
</asp:DropDownList>
<asp:gridview id="gvProducts" runat="server" AutoGenerateColumns="False" 
datakeynames="ProductID" datasourceid="dsProductLookup" 
style="margin-top: 12px;">
<Columns>
     <asp:BoundField DataField="ProductName" HeaderText="ProductName" 
     SortExpression="ProductName" />
</Columns>

</asp:gridview>

<asp:sqldatasource id="dsProductLookup" runat="server" connectionstring="<%$  
ConnectionStrings:ProductsConnectionString %>"
Selectcommand="SELECT ProductID, ProductName FROM [Product] ORDER BY [ProductName]">
 </asp:sqldatasource>

<asp:SqlDataSource ID="dsCompanyFilter" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ProductsConnectionString %>" 
    SelectCommand="SELECT [CompanyName], [CompanyID] FROM [Company]">
</asp:SqlDataSource>

</asp:Content>

This code filters the results in the gridview by Letter and the Dropdown. The problem is with the dropdown list filtering the gridview.

 Protected Sub btnLetter_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim btnLetter As LinkButton = TryCast(sender, LinkButton)
    If btnLetter Is Nothing Then
        Return
    End If
    dsProductLookup.SelectCommand = [String].Format("SELECT ProductID, ProductName 
                                                   FROM [Product] 
                                                   WHERE ([ProductName] LIKE '{0}%') 
                                                   ORDER BY [ProductName]", btnLetter.Text)
 End Sub

This is the part that has the problem. I now get the error, must declare the scalar variable @CompanyID

Protected Sub ddlCompany_SelectedIndexChanged(ByVal sender As Object, ByVal e As 
System.EventArgs) Handles ddlCompany.SelectedIndexChanged
    dsProductLookup.SelectCommand = "SELECT ProductName, CompanyID, CompanyName 
                                     FROM Product, Company 
                                     WHERE CompanyID = @CompanyID 
                                     ORDER BY ProductName"
    dsProductLookup.SelectParameters.Add("@CompanyID", DbType.Int32, 
    ddlCompany.SelectedValue)
End Sub

Answer 1

Deleted my previous answer.

Actually try the following :

dsProductLookup.SelectParameters.Add("@ProductID",
    DbType.Int32, ddlCompany.SelectedValue)

No assignment to value as it is part of the Add. Noticed this when I tried to compile a test of my previous answer which didn’t work.

EDIT: I tried the above code and it worked (did it in C#) but changed it to use DbType.Int32 for second param.