Adding multicolumn sorting to the GridView (C#)
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
string oldExpression = GridView1.SortExpression;
string newExpression = e.SortExpression;
if (oldExpression.IndexOf(newExpression) < 0)
{
if (oldExpression.Length > 0)
e.SortExpression = newExpression + "," + oldExpression;
else
e.SortExpression = newExpression;
}
else
{
e.SortExpression = oldExpression;
}
}
</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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