private void UndefineObjectProperty(string obj_type, string prop_name, bool isAsync, UndefineObjectPropertyCallback callback, Object state)
        {
            var parameterList = new Dictionary<string, string> { { "method", "facebook.data.undefineObjectProperty" } };
            Utilities.AddRequiredParameter(parameterList, "obj_type", obj_type);
            Utilities.AddRequiredParameter(parameterList, "prop_name", prop_name);

            if (isAsync)
            {
                SendRequestAsync<data_undefineObjectProperty_response, bool>(parameterList, new FacebookCallCompleted<bool>(callback), state);
                return;
            }

            SendRequest(parameterList);
        }
 /// <summary>
 /// Remove a previously defined property of an object type. This will remove ALL values of this property of ALL objects of this type. This removal is NOT reversible. 
 /// </summary>
 /// <example>
 /// <code>
 /// 
 /// </code>
 /// </example>
 /// <param name="obj_type">Object type from which a property is removed. </param>
 /// <param name="prop_name">Name of the property to remove. </param>
 /// <param name="callback">The AsyncCallback delegate</param>
 /// <param name="state">An object containing state information for this asynchronous request</param>        
 public void UndefineObjectPropertyAsync(string obj_type, string prop_name, UndefineObjectPropertyCallback callback, Object state)
 {
     UndefineObjectProperty(obj_type, prop_name, true, callback, state);
 }