How to throw user define exception in AX

Today I will demonstrate you that How to throw user define exception in AX.

EmpData e;

 try

{

                    select  e where e.Name=="John";

                    if(!e.Name)

                                         throw error("Invalid Name");

                    else

                                         info(e.Name);

 }

catch(Exception::error)

{

                    error("Exception occured");

}