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<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub GridView1_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
Dim oldExpression As String = GridView1.SortExpression
Dim newExpression As String = e.SortExpression
If (oldExpression.IndexOf(newExpression) < 0) Then
If (oldExpression.Length > 0) Then
e.SortExpression = newExpression & "," & oldExpression
Else
e.SortExpression = newExpression
End If
Else
e.SortExpression = oldExpression
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" Runat="server" DataSourceID="SqlDataSource1"
DataKeyNames="CustomerID" AutoGenerateColumns="False"
AllowSorting="True" OnSorting="GridView1_Sorting">
<Columns>
<asp:BoundField ReadOnly="True" HeaderText="CustomerID"
DataField="CustomerID"
SortExpression="CustomerID"></asp:BoundField>
<asp:BoundField HeaderText="CompanyName" DataField="CompanyName"
SortExpression="CompanyName"></asp:BoundField>
<asp:BoundField HeaderText="ContactName" DataField="ContactName"
SortExpression="ContactName"></asp:BoundField>
<asp:BoundField HeaderText="ContactTitle" DataField="ContactTitle"
SortExpression="ContactTitle"></asp:BoundField>
<asp:BoundField HeaderText="Address" DataField="Address"
SortExpression="Address"></asp:BoundField>
<asp:BoundField HeaderText="City" DataField="City"
SortExpression="City"></asp:BoundField>
<asp:BoundField HeaderText="Region" DataField="Region"
SortExpression="Region"></asp:BoundField>
<asp:BoundField HeaderText="PostalCode" DataField="PostalCode"
SortExpression="PostalCode"></asp:BoundField>
<asp:BoundField HeaderText="Country" DataField="Country"
SortExpression="Country"></asp:BoundField>
<asp:BoundField HeaderText="Phone" DataField="Phone"
SortExpression="Phone"></asp:BoundField>
<asp:BoundField HeaderText="Fax" DataField="Fax"
SortExpression="Fax"></asp:BoundField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" Runat="server"
SelectCommand="SELECT * FROM [Customers]"
ConnectionString="<%$ ConnectionStrings:AppConnectionString1 %>"
DataSourceMode="DataSet"
ConflictDetection="CompareAllValues" EnableCaching="True"
CacheKeyDependency="MyKey" CacheDuration="Infinite">
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
File: Web.config
<configuration>
<appSettings/>
<connectionStrings>
<add name="AppConnectionString1"
connectionString="Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
<system.web>
<compilation debug="true" strict="false" explicit="true">
<codeSubDirectories>
<add directoryName="VB"></add>
<add directoryName="CS"></add>
</codeSubDirectories>
</compilation>
<pages>
<namespaces>
<clear/>
<add namespace="System"/>
<add namespace="System.Collections"/>
<add namespace="System.Collections.Specialized"/>
<add namespace="System.Configuration"/>
<add namespace="System.Text"/>
<add namespace="System.Text.RegularExpressions"/>
<add namespace="System.Web"/>
<add namespace="System.Web.Caching"/>
<add namespace="System.Web.SessionState"/>
<add namespace="System.Web.Security"/>
<add namespace="System.Web.Profile"/>
<add namespace="System.Web.UI"/>
<add namespace="System.Web.UI.WebControls"/>
<add namespace="System.Web.UI.WebControls.WebParts"/>
<add namespace="System.Web.UI.HtmlControls"/>
</namespaces>
</pages>
<authentication mode="Windows"></authentication>
<identity impersonate="true"/>
</system.web>
</configuration>
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