Resource Exception

[VictorN]

Sounds like you leak some GDI resources. Could you show your actual code in onctlcolor() method?

But i never used any sound files in my project.

Dear SaraswathiSrinath,
"Sounds" in this context means "it looks like ...", so your program behavior "looks like" there is a GDI resources leak.

3. I taken the code from google how to set background color for dialog, so i used that code for all my dialog controls(GetDlgCtrlID()).

You may want to look at this very interesting and useful essay:
Changing Dialog Box/CFormView Background Color