If your input string could be less than five characters long then you should be aware that string.Substring
will throw an ArgumentOutOfRangeException
if the startIndex
argument is negative.
To solve this potential problem you can use the following code:
string sub = input.Substring(Math.Max(0, input.Length - 5));
Or more explicitly:
public static string Right(string input, int length)
{
if (length >= input.Length)
{
return input;
}
else
{
return input.Substring(input.Length - length);
}
}