private string URLCombine(string baseUrl, string relativeUrl)
{
if (baseUrl.Length == 0)
return relativeUrl;
if (relativeUrl.Length == 0)
return baseUrl;
return string.Format("{0}/{1}", baseUrl.TrimEnd(new char[] { '/', '\\' }), relativeUrl.TrimStart(new char[] { '/', '\\' }));
}