System.Diagnostics.Process.Start("网址");//默认浏览器打开网页
System.Diagnostics.Process.Start(@"IEXPLORE.EXE",
"网址");//指定IE打开
private void button1_Click(object sender, EventArgs e)
{
System.Diagnostics.Process.Start("IEXPLORE.EXE","http://www.baidu.com");
}
原文：http://www.cnblogs.com/qunshu/p/3617610.html