Combining baseUri and RelativeUri - C#

Combining base Uri and relative Uri

public string AddTwoUri(string baseUri, string relativeUri)         {             string retUri = "";             if (!string.IsNullOrEmpty(baseUri))             {                 if (!baseUri.EndsWith("/"))                 {                     baseUri += "/";                 }                 Uri rootUri = new Uri(baseUri);                 if (!string.IsNullOrEmpty(relativeUri))                 {                     relativeUri = relativeUri.Trim('/');                     Uri davUri = new Uri(rootUri, relativeUri);                     if (davUri != null)                     {                         retUri = davUri.ToString();                     }                 }                 else                 {                     throw new ArgumentNullException("relativeUri", "second parameter of AddTwoUri is null");                 }             }             else             {                 throw new ArgumentNullException("baseUri", "first parameter of AddTwoUri is null");             }             return retUri;         }

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