Thanks a lot for your information. It is usefull.

I have another question. Is there any way improve performance. We abserve that using this AppStyle reduce performance significantly.

How are you styling your controls?
If you are just applying Stylesets i believe there should be little to no hit in performance.

However, if you're actually setting inline styles on the control, then the framework has to go through a bit more to generate a CssClass, conver the style object to css and render it out for you.  If thats the case, i would recommend using the CssClass property of of Style objects instead of using the properties on them. This should significantly improve performance.

instead of Control.Style.Background = Color.Red;
usse Control.Style.CssClass = "MyControlClass"

Then in your own style sheet or on the aspx page:

.MyControlClass{background-color:red;}

-SteveZ

Ok tell me where i am wrong i am trying to do the same but not getting the results y is it so........

i made my own style sheets....... and made classes those are working with my other html tags but not with infragistics tools tags/.///........??????????????????????

Please help........... Plez.............. 

ok i got it some what but can explain me a bit more about this that how i can aaply the css styles on the infragistics tools

or may be u can send me code of a webgrid which is styled by the css stylesheet in asp.net C#.

please this will be a great help i tried the "resetdefaultstyles" key word but donno where to use how to use........

please help........