for (int index = 0; length = map.length; index < length; ++index)
{
    StringInt pair = map[index];  // 27 ticks
    string key1 = map[index].StringValue; // 539 ticks
    string key2 = pair.StringValue; // 534 ticks -- just testing this
    if (string.Equals(key1,target, StringComparison.OrdinalIgnoreCase)) //115 ticks
          return pair.IntegerValue;   // 530 ticks

    return -1; // 19 ticks
}