Page URL With Changing Variables

Often I’ve had to build a page that didn’t allow the datagrid or listview built in sort options so I came up with this function so that you can keep filters and change the sorting and direction of the page.

public string sPageURLwVariables(string sArrow, string sDir)
	{
		string sOriginalURL = HttpContext.Current.Request.Url.PathAndQuery;
		string sCleanURL = "";

		string[] sURLVariables = sOriginalURL.Split(new char[] { '?', '&' });
		if (sURLVariables.GetLength(0) > 0)
		{
			foreach (string sURLVariable in sURLVariables)
			{
				if (sURLVariable != HttpContext.Current.Request.Url.AbsolutePath)
				{
					if (sURLVariable.IndexOf(sArrow, 0) < 1)
					{
						if (sCleanURL != "")
						{
							sCleanURL += "&";
						}
						sCleanURL += sURLVariable;
						Response.Write(sURLVariable + "<br>");
					}
				}
			}
			if (sCleanURL != "")
			{
				sCleanURL = HttpContext.Current.Request.Url.AbsolutePath + "?" + sCleanURL;
			}
			else
			{
				sCleanURL = HttpContext.Current.Request.Url.AbsolutePath;
			}
			return sCleanURL;
		}
		else
		{
			return HttpContext.Current.Request.Url.AbsolutePath;
		}
	}