<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Showing all items in a filtered list</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList AppendDataBoundItems="True" AutoPostBack="True" DataSourceID="SqlDataSource2"
DataTextField="state" DataValueField="state" ID="DropDownList1" runat="server">
<asp:ListItem Value="">ALL</asp:ListItem>
</asp:DropDownList><asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Pubs %>"
ID="SqlDataSource2" runat="server" SelectCommand="SELECT DISTINCT [state] FROM [authors]">
</asp:SqlDataSource>
<br />
<br />
<asp:GridView AutoGenerateColumns="False" DataSourceID="SqlDataSource1"
ID="GridView1" runat="server" DataKeyNames="au_id">
<Columns>
<asp:BoundField DataField="au_id" HeaderText="au_id" ReadOnly="True" SortExpression="au_id" />
<asp:BoundField DataField="au_lname" HeaderText="au_lname" SortExpression="au_lname" />
<asp:BoundField DataField="au_fname" HeaderText="au_fname" SortExpression="au_fname" />
<asp:BoundField DataField="state" HeaderText="state" SortExpression="state" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Pubs %>"
ID="SqlDataSource1" runat="server" SelectCommand="SELECT au_id, au_lname, au_fname, state FROM authors WHERE state = IsNull(@state, state)" CancelSelectOnNullParameter="False">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="state" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
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