I have a dictionary declared as follows

IDictionary<string, object> _objectIds = new Dictionary<string, object>();

I was experiencing some problems with it and it discovered that the instance returned false as a result of ContainsKey method and from the watch window I was sure that the item was there. So I created helper method

private bool IdsContainsKey(string key)
{
  lock (syncObject)
  {
     lock (_objectIds)
     {
       if (_objectIds.ContainsKey(key))
         return true; // A
       if (_objectIds.ContainsKey(key))
         return true; // B
       return _objectIds.ContainsKey(key); // C
     }
  }
}

During my debugging session I run into situation when the method exited in place B and sometimes I made to C returning true. Can anybody help me? Thanks.