protected void Button1_Click(object sender, EventArgs e)
{
UserInfo userinfo = new UserInfo();
userinfo.UserName = "******";
userinfo.UserId = 1;
userinfo.GroupId = 1;
FormsPrincipal <UserInfo> .SignIn("yanzhiwei", userinfo, 1);
FormsPrincipal <UserInfo> .RedirectDefaultPage("yanzhiwei");
}