Hi Vikas,
Using the formUID to perform checks using hardcoded values in code is not a good idea.
You should use the FormType to distinguish your form from other types (e.g.: SO = 139, AR/Invoice = 133). The numbers are the type of the form, not its uid.
During the events you usually have a FormUID property in the event info which allows you to pinpoint which form triggered the event.
If you use just one FormUID (hardcoded in the form) then you lose the ability to open multiple instances of that form.
Best regards,
Pedro Magueija