title: setting gridview header color
body: <p>i am working in asp.net and c#
  i have a grid view. i have 10 columns in that grid view. I have some problems with grid view header text color.
  some of the columns header have link (for sorting). the color of such header text is a light blue.after clicking the blue color change to another color.</p>
  
  <p>some of columns header does not have link. the color of such header text is gray. </p>
  
  <p>i want to make the color of entire header text to single color like gray. after clicking the link it must be in same color.
  thanks in advance</p>