Question

I have a class A and class B

Class A has:

public int ID
{
    get;    
    set;
}

when running program a value is assigned to ID ex:123 and destroyed when form is closed and set a default value i.e = 0

Ques: how can i save the value in class B before it get destroyed?
so i can have the can access the value in class B and perform validation.

Answer 1

Let me suppose that Class A and Class B are win-forms and you are opening A from B. Write in form A a method like:

public int GetInput(){
   Show();
   return ID;
}

Also in A‘s constructor write following line

public A()
{
    Visible=false;
}

In form B write following to open form A:

public void OpenA()
{
    var a=new A();
    var i=a.GetInput();
}

Now i contains value of ID.