[Solved] ConfigurationManager.ConnectionStrings: NULL reference exception ASP.Net

Hi,

please refer below code.

C#

string connectionString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;

Web.Config

 <configuration>
    <connectionStrings>
        <add name="ConString" connectionString="Data Source=Mudassar-PC\SQL2005;Initial Catalog=Northwind;Integrated Security=true"/>
    </connectionStrings>
</configuration>

Note : Connection string name must be same in C# code as well as  web.config file.