using System;
public class MainClass
{
public static void Main()
{
UriBuilder baseUri = new UriBuilder("http://www.google.com/default.aspx?Param1=7890");
string queryToAppend = "param2=1234";
if (baseUri.Query != null && baseUri.Query.Length > 1)
baseUri.Query = baseUri.Query.Substring(1) + "&" + queryToAppend;
else
baseUri.Query = queryToAppend;
}
}