using System;

using System.IO;

using System.Text;

using System.Xml.Serialization;

public class Program

{

    public static void Main()

    {

        int width = 45;

        string sGuest = "Nasreddine";

        string sBride = "Jane";

        string sGroom = "John";

        Console.WriteLine(new String('*', width));

        Console.WriteLine(Center(sGuest, width));

        Console.WriteLine(Center("is invited to the wedding of:",width));

        Console.WriteLine(Center(sBride + " and " + sGroom, width));

        Console.WriteLine(Center("On Saturday 17 July 2016 at 2:00pm", width));

        Console.WriteLine(new String('*', width));

        Console.ReadLine();

    }

    public static string Center(string str, int length)

    {

        if (string.IsNullOrWhiteSpace(str))

        {

            return new String(' ',length);

        }

        if (str.Length >= length)

        {

            return str;

        }

        var halfDiff = (length - str.Length)/2.0;

        return string.Format("{0}{1}", new String(' ', (int) Math.Floor(halfDiff)), str) ;

    }

}

​

​