http://msdn.microsoft.com/en-us/library/windows/desktop/bb172602%28v=vs.85%29.aspx

Magnificent, thanks Emre. I spent hours looking and never got close!

You're welcome. I know msdn search is awful. I found the page with " srgbtexture ". Not with "sampler state" or "sampler type".

ok thanks dear Hummel for help , but i dont know how to use your code.
i try for use it in an effect in material but i see W1550.

help me please.

Get your shader code, look where your sampler is, replace it with the sampler Hummel posted. There is only one sampler, you cannot miss it. You don't need any shader knowledge at all for this. Please don't double post.