ConnectionString with DAPPER ORM not working
<p>I created following Repository file </p>

<pre><code>using Dapper;
using System.Configuration;

namespace ProjectName.Repository
{
    public class SMRTRepository : IDashboard
    {
        public SqlConnection con;
        //To Handle connection related activities
        private void connection()
        {
            string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
            con = new SqlConnection(constr);
        }

        .........
    }
}
</code></pre>

<p>Then In that project created a App.Config File to define connection string, </p>

<p><strong>App.config</strong></p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
&lt;configuration&gt;
  &lt;connectionStrings&gt;
    &lt;add name="ConnectionString" connectionString="Data Source=USER-PC;Initial Catalog=DBNAME;User ID=sa;Password=****;Integrated Security=True;" providerName="System.Data.sqlclient"/&gt;
  &lt;/connectionStrings&gt;
&lt;/configuration&gt;
</code></pre>

<p>but then when I run this , its not connecting to DB , In Server Explorer window in Visual Studio I can see connection string connecting to DB without Red icon </p>

<p>whats wrong in my approach </p>