How to access sql connection using Method in ASP.NET

In Web.Config

 <connectionStrings>
     <add name="connection" connectionString="Data Source=.\SQLEXPRESS;Integrated Security=True;Initial Catalog=test;" providerName="System.Data.SqlClient" />
   </connectionStrings>



In DBClass.cs this is the class file 

using System.Data.SqlClient;
using System.Data;
using System.Web.Configuration;

//Get Connection String
    public static string connectionstring = WebConfigurationManager.ConnectionStrings["connection"].ConnectionString;

//Get Connection
    public static SqlConnection GetDbConnection()
    {
        return new SqlConnection(connectionstring);
    }


In Your aspx.cs

 SqlConnection con = DBClass.GetDbConnection();
SqlCommand cmd = new SqlCommand ("your sql command",con);
cmd.Connection.Open();
cmd.ExecuteNonQuery();
cmd.Connection.Close();