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You can either use custom validation where u can pass ur custom validation function , where
u can write ur validation code for text box or listbox.

or

You can validate this two control on...

Shared assembly is a type of assembly which can be used in .net application.
So u have to use Add Reference to add shared assembly.

// In general declaration
static class test
{
public static s as string; // Declare static variable . so that u can use in any one class by using (test.s)
public static void show()
{ ...