System.Data.Entity.Core.EntityException: The underlying provider failed on Open

Code Example - System.Data.Entity.Core.EntityException: The underlying provider failed on Open

                
                        <add name="ConnectionStringName"
    providerName="System.Data.SqlClient"
    connectionString="Data Source=ServerName\InstanceName;Initial Catalog=DatabaseName;    Integrated Security=True;MultipleActiveResultSets=True" />