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These attachments should show you how to do it:
1. The original image. Don't be overwhelmed by the high artistic aesthetic of this image ;-). We were donating a bunch of kid's clothing and I was pressed into service photographically documenting the give-aways. This was the first image I grabbed that had a line of colored objects that would readily demonstrate selective desaturation.
2. The layer stack. I happened to use a vibrance / saturation adjustment layer, but one could just as easily use a B&W adjustment layer, a hue/saturation adjustment layer, or just use the desaturate command on a copy of the original. Also, I filled my layer mask with a simple left-to-right gradient from black to white. It's entirely up to you what angle you use, or you may consider manually painting in black where you want the original to show and white where you want the desaturation effect to show.
3. The result.
Tom M
Dear Adhossain, did you adjust the vibrance and saturation sliders to their extreme left positions? If you didn't move the sliders this layer will have no effect.
Tom M
Thanks. Finally I've done it