怎么让浏览器显示自己的html文档

{

//测试用html代码

string str = "<DIV style=\"BORDER-RIGHT: #ff44ff 2pt solid; BORDER-TOP: #ff44ff 2pt solid; BORDER-LEFT: #ff44ff 2pt solid; BORDER-BOTTOM: #ff44ff 2pt solid\"><DIV align=center><FONT style=\"FONT-SIZE: 20pt; FILTER: shadow(color=#000000); WIDTH: 100%; COLOR: #f70c00; FONT-FAMILY: arail\"><B>Thanks God Is Friday</B></FONT> </DIV></DIV>";

mshtml.IHTMLDocument2 doc = (mshtml.IHTMLDocument2)axWebBrowser1.Document;

doc.body.innerHTML = str;

}