public override String ToString()
    {
     	Type objType = this.GetType();
     	PropertyInfo[] propertyInfoList = objType.GetProperties();
     	StringBuilder result = new StringBuilder();
     	foreach (PropertyInfo propertyInfo in propertyInfoList)
      	   result.AppendFormat("{0}:{1},", propertyInfo.Name, propertyInfo.GetValue(this));
          
     	 return "{" + result.ToString() + "}";
     }