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Building connection strings using ConnectionStringBuilder (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 Page_Load(object sender, EventArgs e)     {         System.Data.SqlClient.SqlConnectionStringBuilder builder = new System.Data.SqlClient.SqlConnectionStringBuilder();         builder.DataSource = "localhost";         builder.InitialCatalog = "Northwind1";         builder.UserID = "sa";         builder.Password = "password";         builder.PersistSecurityInfo = true;         Configuration config = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("/Yourroot");         config.ConnectionStrings.ConnectionStrings["AppConnectionString1"].ConnectionString = builder.ConnectionString;         config.Save();     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>          </div>     </form> </body> </html>