title: Check if property has attribute
body: <p>Given a property in a class, with attributes - what is the fastest way to determine if it contains a given attribute? For example:</p>
  
  <pre><code>    [IsNotNullable]
      [IsPK]
      [IsIdentity]
      [SequenceNameAttribute("Id")]
      public Int32 Id
      {
          get
          {
              return _Id;
          }
          set
          {
              _Id = value;
          }
      }
  </code></pre>
  
  <p>What is the fastest method to determine that for example it has the "IsIdentity" attribute?</p>