>how to change screen resolution from or before my app progrmatically.
>I have designed all my screen for 800x600 and any other resolution dont show them properly.
Rajesh, it is generally accepted and recommended to *not* change an end-users screen resolution. But if you insist you can check out these posts:
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In the End, we will remember not the words of our enemies, but the silence of our friends - Martin Luther King, Jr.