.NET Fiddle

CSharp · Console

/Program.cs

using System;

public class Program
{
	public void Main()
	{
		Console.WriteLine(" Hello World! ".CenterString(80, '#'));
	}
}

public static class StringExtensions
{
	public static string CenterString(this string stringToCenter, int totalLength)
	{
		return stringToCenter.PadLeft(((totalLength - stringToCenter.Length) / 2) + stringToCenter.Length).PadRight(totalLength);
	}

	public static string CenterString(this string stringToCenter, int totalLength, char paddingCharacter)
	{
		return stringToCenter.PadLeft(((totalLength - stringToCenter.Length) / 2) + stringToCenter.Length, paddingCharacter).PadRight(totalLength, paddingCharacter);
	}
}