Removing a querystring from url in asp.net

HI, I need to remove a querystring when a user clicks a particular LinkButton.
So for example if the querystring is http://UserProfileManager.com?UserID=1234 …. when the user clicks on the Linkbutton, I want the url to be http://UserProfileManager.com. The issue is that everything is on one page, and I am using asp:panel to show and hide different areas of the webpage.

HTML table tag with col, colgroup, tbody, and thead throws compile error in Visual Studio 2010 and Visual Studio 2012

I have a .NET 3.5 web site with a table tag that contains col, colgroup, tbody and thead tags. This is a server side tag with the runat=”server” attribute. This table was working fine in Visual Studio 2010, but after I installed Visual Studio 2012 and .NET 4.5, this tag now fails to compile in Visual Studio 2010 and in Visual Studio 2012. (I tried both.) Here are the compiler errors that are being thrown: