act : 6 globe smart and sun

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 WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}


private void button1_Click(object sender, EventArgs e)
{
StringBuilder input = new StringBuilder(textBox1.Text);


StringBuilder yahoo = new StringBuilder();


if (input.Length == 11)
{
yahoo = input.Remove(4, 7);


switch (yahoo.ToString())
{
case "0906":
label1.Text = "GLBOE";
break;
case "0927":
label1.Text = "GLBOE";
break;
case "0926":
label1.Text = "GLBOE";
break;
case "0915":
label1.Text = "GLBOE";
break;
case "0917":
label1.Text = "GLBOE";
break;
case "0905":
label1.Text = "GLBOE";
break;
case "0916":
label1.Text = "GLBOE";
break;


case "0978":
label1.Text = "smart";
break;
case "0909":
label1.Text = "smart";
break;
case "0919":
label1.Text = "smart";
break;
case "0920":
label1.Text = "smart";
break;
case "0921":
label1.Text = "smart";
break;
case "0908":
label1.Text = "smart";
break;
case "0922":
label1.Text = "sun";
break;
case "0923":
label1.Text = "sun";
break;
case "0933":
label1.Text = "sun";
break;
case "0932":
label1.Text = "sun";
break;
case "0935":
label1.Text = "TM";
break;
default:
label1.Text = "wrong answer";
break;
}


}
else
MessageBox.Show("yahoo");


}
}