public variable in function c# code example

Example: how to make a global string c#

public static class Globals
{
    public const Int32 BUFFER_SIZE = 512; // Unmodifiable
    public static String FILE_NAME = "Output.txt"; // Modifiable
    public static readonly String CODE_PREFIX = "US-"; // Unmodifiable
}

String code = Globals.CODE_PREFIX + value.ToString();