c# - Constructor has 2 parameters but is invoked with 1 argument -

i have following class:

public class notifications {     public static notifications instance = new notifications();      public notificationhubclient hub { get; set; }      private notifications() {         hub = notificationhubclient.createclientfromconnectionstring( "<conn string full access>", "<hub name>");     } } 

i'm trying modify code pass dynamically values of connection string , name of hub constructor,i changed constructor this:

private notifications(string connectionstring,string hubname) {...} 

the problem have instance ,as can notice it's calling constructor no parameters,i tried change didn't work:

public static notifications instance = new notifications( string connectionstring,string hubname); 

what should make instance call constructor , pass 2 parameters?

instance doesn't have access parameter value - has provide value them!

so can following:

public static notifications instance = new notifications("<conn string full access>", "<hub name>");