Access Connection String from code behind
using System.Configuration; // Configuration Manager
//Accessing connection Sting as usual if encrypted too
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["SqlCon"].ConnectionString);
Storing Connection String in web.config
<configuration>
<appSettings />
<connectionStrings>
<add name="SqlCon" connectionString="Server=syntaxhelp; Database=syntaxhelp; User ID=sa; password= hima; "
providerName="System.Data.SqlClient" />
</connectionStrings>