How to add custom CSS in your WebPart

If you want to add custom CSS file for your webpart, here is the code:

1. protected override void CreateChildControls()
2. {
3. base.CreateChildControls();
5. CssLink cssLink = new CssLink();
6. cssLink.DefaultUrl = “/_layouts/Test.css”;
7. this.Page.Header.Controls.Add(cssLink);
8. }