Snippet from 2009 blog post ".NET - Retrieving the Month Name"

MN1.cs

/// <summary>
/// Converts a month number into the name
/// </summary>
/// <param name="monthNumber"></param>
private string GetMonthName(int monthNumber)  
{
    return String.Format("{0:MMMM}", new DateTime(1969, monthNumber, 1));
}

MN2.cs

System.Globalization.DateTimeFormatInfo.CurrentInfo.GetMonthName(monthNumber)