dim gridview color while server process

Question

hi this is kavita

can anyone tell me how to dim color of gridview while server is processing. like google login.actually I am using gridview an display some data I want when user is going to next page or searching some new word present gridview color change just dim or some image over gridview.I am using Update progess  and display some text and image while processing but I need to change color say dim color while server processes.

please help!!