For entire Application you can define like pubilc v_name as string
in code file and for particular class you can define like public v_name as string and for particular function you can define like dim v_name as string
Thanks for your information.
I understand the vairable is declared in "Module.vb" and can be used in multiple form. But, this method can't be used and shared between multiple projects. So, I get the problem for this issue.
Do you have any better ideal?