How to make stored procedure with outputs OUT sys_refcursor, OUT varchar2, and OUT number, then use in c#.net app
Your procedure is missing two OUT parameters:

PROCEDURE myprocedure (myinput      IN Varchar2, 
                       myretcursor  OUT sys_refcursor,
                       p_count      OUT NUMBER,
                       p_message    OUT VARCHAR2) IS
BEGIN
   OPEN myretcursor FOR
      SELECT * FROM MYTABLE;
   p_count := 123;
   p_message := 'message';
END myprocedure


You would also need to modify your C# code to register the new OUT parameters accordingly.