I have Googled and looked and looked. What is the best cleanest way to format a social security number to look like xxx-xx-xxxx?

And as long as I am asking, how about how to ensure that a nine digit number is entered?

Thank you!

Which control are you using to take SSN from user?

And SSN format differs from place to place which country's SSN You are talking about?

Hello AbelLazm, Its just me again with the taxpayer code I am working on. US SSN so dashes after 3rd and 5th number in series. Has to be entered as a string.

//  Implement a for-loop that will prompt the user to enter the Social Security Number and gross income.
                for (x = 1; x < taxArray.Length; ++x)
                {
                    taxArray[x] = new Taxpayer();
                    Console.Write("Please enter the Social Security Number for taxpayer {0}, (format as xxx-xx-xxx):  ", x);
                    taxArray[x].SSN = Console.ReadLine();

try this code

String s="";
            bool flag = true;
            while (flag)
            {
                Console.WriteLine("Enter the string");
                s = Console.ReadLine();
                if (s.Length != 9)
                    Console.WriteLine("Wrong Input String must have 9 charachters Enter again");
                else flag = false;

            }
            //Format according to xxx-xx-xxxx
            s = String.Format("{0}-{1}-{2}", s.Substring(0, 3), s.Substring(3, 2), s.Substring(5, 4));
            Console.WriteLine(s);
            Console.ReadLine();
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            textBox1.MaxLength = 11;
            textBox1.TextAlign = HorizontalAlignment.Center;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            {
                if (textBox1.Text.Length == 3)
                {
                    textBox1.Text += '-';
                    textBox1.SelectionStart = 5;
                }
                if (textBox1.Text.Length == 6)
                {
                    textBox1.Text += '-';
                    textBox1.SelectionStart = 8;
                }

            }
        }
    }
}