View difference between Paste ID: PNBtU3KE and ppS5c8kr

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace Junkie_s_ShoutBox
 {
     public partial class frmShoutBox : Form
     {
         string username = "Guest";
         bool signIn = false;
         bool signedUp = false;
         public frmShoutBox()
         {
             InitializeComponent();
         }
 
         private void btnSignUp_Click(object sender, EventArgs e)
         {
             username = txtUsername.Text;
             string password = txtPassword.Text;
             lblUser.Text = "Signed in as " + username + ".";
             signIn = true;
             signedUp = true;
             MessageBox.Show("You have signed up as " + username + ". You are now signed in.");
         }
 
         private void btnSignIn_Click(object sender, EventArgs e)
         {
             if (txtUsernameSignIn.Text != txtUsername.Text)
             {
                 MessageBox.Show("You have entered an invalid username.");
             }
             else if (txtSignInPassword.Text != txtPassword.Text)
             {
                 MessageBox.Show("You have entered an invalid password.");
             }
             else if (signedUp == false)
             {
                 MessageBox.Show("You have not signed up yet");
             }
             else if (signIn == true)
             {
                 MessageBox.Show("You are already signed in as " + username + ".");
             }
             else
                 MessageBox.Show("Welcome!");
             signIn = true;
 
         }
 
         private void btnSignOut_Click(object sender, EventArgs e)
         {
             MessageBox.Show("You have been signed out.");
             lblUser.Text = "Signed in as Guest.";
             signIn = false;
         }
 
         private void btnPost_Click(object sender, EventArgs e)
         {
             if (signIn == false)
             {
                 MessageBox.Show("Please sign in or post as guest");
             }
             else if (signIn == true)
             {
                 string comment = txtComment.Text;
                 lblComments.Text = username + ": " + comment;
             }
         }
         private void btnGuest_Click(object sender, EventArgs e)
         {
             string comment = (txtComment.Text);
             if (signIn == true)
             {
                 MessageBox.Show("You are signed in as " + username + ". Click post to comment as this poster or sign out to post as a guest");
             }
             else
             {
                 MessageBox.Show("Comment posted!");
                 lblComments.Text = "Guest: " + comment;
                 System.IO.File.WriteAllText(@"C:\Users\Brooke\Documents\Visual Studio 2012\Projects\comments.txt",comment);
             }
         }
     }
 }