nullReferenceException was unhandled

If you are  facing error like
nullReferenceException  was unhandled by user id
 then you have to check  your  APP   name and connection string
check your web.congfig file

<connectionStrings>
    <add name="connect" connectionString="Data Source=pc_name\SQLEXPRESS;Initial Catalog=stud;Integrated Security=True"/>
  </connectionStrings>
Add name and  again back to code behind on page load and check this line
  string conStr = WebConfigurationManager.ConnectionStrings["stud"].ConnectionString;
    SqlConnection con = new SqlConnection();
In the place of stud that I sactually my database name write add name that is
Add name=”connect” replace with “stud”

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