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POASP.NET/VB dropdownlist not properly populating gridview
 

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  1. POASP.NET/VB dropdownlist not properly populating gridview
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    <p>I'm rather new to ASP.NET, but I have to create a .aspx form with VB that when selecting a customer from the ddl, it will populate gridview with the customer's orders from an Access database.</p> <p>So far, my problem is that when I try and select any other customer than the first one, the gridview doesn't repopulate with new information. Rather it stays stuck on the first customer's information.</p> <p>Here's what I have so far:</p> <pre><code>&lt;%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="Technical_Challenge.WebForm1" %&gt; &lt;!DOCTYPE html&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;Technical Challenge&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:Label ID="Label1" runat="server" Text="Customers"&gt;&lt;/asp:Label&gt; &lt;br /&gt; &lt;asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="CustomerName" DataValueField="CustomerID"&gt; &lt;/asp:DropDownList&gt; &lt;asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="&lt;%$ ConnectionStrings:TechChallengeConnectionString %&gt;" ProviderName="&lt;%$ ConnectionStrings:TechChallengeConnectionString.ProviderName %&gt;" SelectCommand="SELECT [CustomerID], [CustomerName] FROM [Customers] ORDER BY [CustomerName]"&gt;&lt;/asp:SqlDataSource&gt; &lt;asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="&lt;%$ ConnectionStrings:TechChallengeConnectionString %&gt;" ProviderName="&lt;%$ ConnectionStrings:TechChallengeConnectionString.ProviderName %&gt;" SelectCommand="SELECT * FROM [Orders] WHERE ([CustomerID] = ?)"&gt; &lt;SelectParameters&gt; &lt;asp:ControlParameter ControlID="DropDownList1" Name="CustomerID" PropertyName="SelectedValue" Type="Int32" /&gt; &lt;/SelectParameters&gt; &lt;/asp:SqlDataSource&gt; &lt;br /&gt; &lt;asp:Label ID="CustomerOrdersLabel" runat="server" Text="Customer Orders"&gt; &lt;/asp:Label&gt; &lt;br /&gt; &lt;asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="OrderID" DataSourceID="SqlDataSource2" ForeColor="#333333" GridLines="None"&gt; &lt;AlternatingRowStyle BackColor="White" ForeColor="#284775" /&gt; &lt;Columns&gt; &lt;asp:BoundField DataField="OrderID" HeaderText="OrderID" InsertVisible="False" ReadOnly="True" SortExpression="OrderID" /&gt; &lt;asp:BoundField DataField="CustomerID" HeaderText="CustomerID" SortExpression="CustomerID" /&gt; &lt;asp:BoundField DataField="OrderPrice" HeaderText="OrderPrice" SortExpression="OrderPrice" /&gt; &lt;/Columns&gt; &lt;EditRowStyle BackColor="#999999" /&gt; &lt;FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /&gt; &lt;HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /&gt; &lt;PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /&gt; &lt;RowStyle BackColor="#F7F6F3" ForeColor="#333333" /&gt; &lt;SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /&gt; &lt;SortedAscendingCellStyle BackColor="#E9E7E2" /&gt; &lt;SortedAscendingHeaderStyle BackColor="#506C8C" /&gt; &lt;SortedDescendingCellStyle BackColor="#FFFDF8" /&gt; &lt;SortedDescendingHeaderStyle BackColor="#6F8DAE" /&gt; &lt;/asp:GridView&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The code-behind:</p> <pre><code>Public Class WebForm1 Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load End Sub Protected Sub SqlDataSource1_Selecting(sender As Object, e As SqlDataSourceSelectingEventArgs) Handles SqlDataSource1.Selecting End Sub End Class </code></pre> <p>Any help would be greatly appreciated. Thanks!</p>
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