[Solved]How to connect to App Config in c#

See more:

C#

HI, I am developing an application , where it references to a DAl which has APP.Config file, i have given Connection string in it like this.

<configuration>
  <connectionStrings>
    <add name="Cont" 
    connectionString="Data Source=.;Initial Catalog=ChManagement;Integrated Security=True"/>
  </connectionStrings>
</configuration> 

and i am trying to connect it by

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

var connectionString=ConfigurationManager.ConnectionStrings["Cont"].ConnectionString;

But i am getting null in connectionstring variable and also i am referencing to System.Configuration dll