>I have a class (derived from form ) which is the base class
>for my form say "Try". I have one Push Buttonin it with
>code in Click Event "ThisForm.Release"
>It works perfectly when I run this form.But, when I run
>this form in my Application it dosen't work. I have to click
>X button to close this form.
>
>Any idea ? ? ?

Are you sure there's only one instance of it? This happened to me recently, I accidentally launched a form twice (well, we all goof up once in awhile :), and it appeared nothing happened with the Close/Thisform.Release button on the form, even though it was closing one copy of the form...