Urls.cs

public static string ResolveUrl(string url)
{
    string appDomainAppVirtualPath = HttpRuntime.AppDomainAppVirtualPath;
    return url.StartsWith("~/") ? appDomainAppVirtualPath + url.Substring(appDomainAppVirtualPath != null && appDomainAppVirtualPath.EndsWith("/") ? 2 : 1) : url;
}

public static string ResolveUrl(string url, object queryStringParams, bool skipEmptyValues = true)
{
    if (queryStringParams == null) return ResolveUrl(url);
    var sb = new StringBuilder(ResolveUrl(url));
    var firstParam = !url.Contains("?");
    foreach (PropertyDescriptor p in TypeDescriptor.GetProperties(queryStringParams))
    {
        var value = p.GetValue(queryStringParams);
        if (value == null) continue;
        var valueToString = value.ToString();
        if (string.IsNullOrEmpty(valueToString) && skipEmptyValues) continue;
        sb.AppendFormat(firstParam ? "?{0}{1}{2}" : "&{0}{1}{2}", p.Name.UrlEncode(), '=', valueToString.UrlEncode());
        firstParam = false;
    }
    return sb.ToString();
}

public static string GlobalResolveUrl(string url, object queryStringParams)
{
    var relativeUri = ResolveUrl(url, queryStringParams);
    if (relativeUri == null)
        return null;
    var uri = new UriBuilder(new Uri(HttpContext.Current.Request.Url, relativeUri));
    return uri.Uri.GetLeftPart(UriPartial.Query);
}