Sequence Contains no elements on Assemble class

Question

HI ,

 

I am gettting error like sequence contains no elements on folllowing

foreach (int id in tid)

{ 

ImportRoutines.customer.processCustomerImport(ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString, id);

 

}

and class defination is like this

namespace ImportRoutines

{

  public static void processCustomerImport(string connectionstring, int id);

  public static void processCustomerImport(string connectionstring, int id, out int cusId); 

} 

 

thanks in advance