TryParse.cs

// http://twitter.com/raboof/statuses/4974353119

static partial class TryParse
{
    public static int? Int32(string str)
    {
        return Int32(str, null);
    }

    public static int? Int32(string str, int? defaultValue)
    {
        int result;
        return int.TryParse(str, out result) ? result : defaultValue;
    }
}