Call a sys_refcursor with entity framework ASP.NET MVC

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Oracle

MVC

I have a procedure in oracle database same this:

PROCEDURE   milad_101 ( INAMT IN  NUMBER ,RESULT_OUT OUT sys_refcursor  )
IS 
 begin
   
       open RESULT_OUT for   'select shenaseh,pardakhtkey,mablaghkol from LASTtable where  mablaghkol>='|| inAMT ;
 
     commit;
   
End; 

my webapi is:

public string GetGis(Int64 id)
       {
            
           var res = db.milad_101( id);
          
           return (res).ToString();
       }

What I have tried:

when i run program ,visual studio show this error:
ORA-06550: line 1, column 8:
PLS-00306: wrong number or types of arguments in call to 'milad_101'
ORA-06550: line 1, column 8:
PL/SQL: Statement ignored
what do i please?