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How to use GetXml() method in asp.net xml ADO.NET

<%@ Page Language="C#" AutoEventWireup="true" %>  
<%@ Import Namespace="System.Web.Configuration" %>  
<%@ Import Namespace="System.Data" %>  
<%@ Import Namespace="System.Data.SqlClient" %>  
<%@ Import Namespace="System.IO" %>  
  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<script runat="server">  
    void Button1_Click(object sender, System.EventArgs e)  
    {  
        string connString = WebConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;  
        string sql = "Select Top 2 ProductID, ProductName, QuantityPerUnit, UnitPrice from Products";  
        DataSet productsDataSet = new DataSet();  
        SqlConnection conn = new SqlConnection(connString);  
        using (conn)  
        {  
            SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);  
            adapter.Fill(productsDataSet);  
            GridView1.DataSource = productsDataSet;  
            GridView1.DataBind();  
        }  
        Literal1.Text = Server.HtmlEncode(productsDataSet.GetXml());  
        Label1.Text = "XML from DataSet";  
    }  
</script>  
<html xmlns="http://www.w3.org/1999/xhtml" >  
<head id="Head1" runat="server">  
    <title>XML GetXml() - How to use GetXml() method in asp.net xml ADO.NET</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:DarkBlue; font-style:italic;">XML and ADO.NET Example: How To Use GetXml() Method</h2>  
        <hr width="575" align="left" color="DarkBlue" />  
        <br />  
        <asp:GridView   
            ID="GridView1"  
            runat="server"  
            BorderColor="Pink"  
            ForeColor="HotPink"  
            >  
        </asp:GridView>  
        <br />  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Bold="true"  
            Text=""  
            ForeColor="OrangeRed"  
            Font-Size="Large"  
            Font-Names="Comic Sans MS"  
            >  
        </asp:Label>  
        <br />  
        <asp:Literal   
            ID="Literal1"  
            runat="server"  
            >  
        </asp:Literal>  
        <br /><br />  
        <asp:Button   
            ID="Button1"  
            runat="server"  
            OnClick="Button1_Click"  
            Text="Get XML From DataSet"  
            Height="40"  
            Font-Bold="true"  
            ForeColor="DarkBlue"  
            />  
    </div>  
    </form>  
</body>  
</html>  

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