RadGrid lost css when copy from example

[Hoi]

hi everboy i'm new to RadGrid and  i found this example  at site 

http://demos.telerik.com/aspnet-ajax/controls/examples/integration/gridandwindow/defaultcs.aspx?product=grid

and i copy all file and this work find, but when it run this show error, plz help me, thank

 

[Eyup]

Hi Tran,

Here are some steps you can try:

1. Make sure that you've added the Telerik.Web.UI.Skins.dll assembly in your project.
2. Set RenderMode to Classic or Lightweight.
3. Material Skin is only available with Lightweight.
4. Ensure that the EnableEmbeddedSkins and EnableEmbeddedBaseStylesheet
properties are not disabled:
http://docs.telerik.com/devtools/aspnet-ajax/general-information/performance/disabling-embedded-resources#disabling-embedded-skins

I hope this will prove helpful.

Regards,
Eyup
Telerik by Progress