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C# Static members
public class ClassA
{
     private static int UserId;

     private static AssignIdToUser(string token)
     {
         UserId = <int value depending on result of db query>;
     }

     public SendMessage(string token, string message, string toaddress)
     {
         AssignIdToUser(token);
         Message msg = new Message(); //This is just a sample of a class that is similar to the one I use
         msg.Message = message;
         msg.UserId = UserId;
         msg.ToAddress = toaddress;
         //add class to db and save
     }
}

ClassA.SendMessage("userstoken", "This is a message", "0123456789");

var userId = AssignIdToUser(token);
....
msg.UserId = userId;

private static int getUserIdForToken(String token) {
     ...
     return <int value depending on result of db query>;
 }