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C# RichTextBox edit count character deleted

I have a RichTextBox in a C# project. Adding characters and counting the number of characters per line works.
The issue comes when I try to delete characters with the Backspace Key
I have commented out the code I have tried while pressing the Backspace Key
I also tried to use a KeyPress event to manage counting characters deleted complete fail.
If anyone would like to test the code here are the properties of the RichTextBox Name rtbInfo.
Size 347 by 120 Font 10.8 Bold WordWrap False NO Scroll Bars Max Length 135
GOAL Increase the variable res by 1 for each character or space deleted with the press of the Backspace Key.
I would prefer to not use KeyPress KeyUp or KeyDown Events if at all possible.
Happy to consider code suggestions with those Event designs.
public partial class frmRTB : Form
{
int Count = 0;
int Lines = 0;
int cT = 0;
int res = 0;
public frmRTB()
{
InitializeComponent();
//rtbInfo.KeyPress += rtbInfo_KeyPress;
/*=== This Must be here to register rtbInfo ===*/
/*=============================================*/
}
private void frmRTB_Load(Object sender, EventArgs e)
{
ActiveControl = rtbInfo;
}
/*private void rtbInfo_KeyPress(object sender, KeyPressEventArgs e)
{
if (rtbInfo.TextLength == 0)
{
tbMessage.Text = "Nothing to Delete";
return;
}
if (e.KeyChar == ((char)Keys.Back) & (char.IsControl('\b')))
{
//rtbInfo.Text = rtbInfo.Text.Remove(rtbInfo.TextLength - 1, 0);
//rtbInfo.Select(rtbInfo.TextLength - 0, 0);
//rtbInfo.ScrollToCaret();
//cT = cT - 1;
//res = - 1;// Last edit was res - cT ?
//tbCount.Text = "Back Fire";
//e.Handled = true;
}
}*/
public void rtbInfo_TextChanged(Object sender, EventArgs e)
{
Count = rtbInfo.TextLength;
Lines = rtbInfo.Lines.Length;
foreach (char chr in rtbInfo.Text)
{
if (char.IsLetterOrDigit(chr))
{
cT = cT + 1;
res = 33 - cT;
}
/*
Regex regex = new Regex(#"^[\b]+$");
//Regex regex = new Regex(#"^[\b\S\t\D\W]+$");
if (regex.IsMatch(rtbInfo.Text))
{
tbCount.Text = "Use BACKSPACE Key to Edit";
}*/
//if (chr == '\b')
//if (chr == ((char)Keys.Back))
// tried above if statments they do not fire
// This fires when any key is entered NOT just the Backspace key
/*if (char.IsControl('\b'))// & !(char.IsLetterOrDigit(chr)))
{
//rtbInfo.Text = rtbInfo.Text.Remove(rtbInfo.TextLength - 1, 0);
//rtbInfo.Select(rtbInfo.TextLength - 0, 0);
//rtbInfo.ScrollToCaret();
res = +1;
tbCount.Text = "Use BACKSPACE Key to Edit";
}*/
if (Lines == 5 | Count == 135)
{
rtbInfo.ReadOnly = true;
}
if (rtbInfo.ReadOnly == true)
{
txtBoxMsg.Text = "";
tbMessage.Text = "";
tbCount.Text = "Use BACKSPACE Key to Edit";
}
if (rtbInfo.Text.EndsWith("\n"))
{
cT = 0;
res = 0;
}
if (cT == 33)
{
SendKeys.Send("{ENTER}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
cT = 0;
res = 0;
}
if (rtbInfo.ReadOnly == true)
{
string message = "Press YES to edit Notes" + '\n' + " NO Clear Notes";
string title = "Edit Notes";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result = MessageBox.Show(message, title, buttons);
if (result == DialogResult.Yes)
{
rtbInfo.ReadOnly = false;
SendKeys.Send("{BACKSPACE}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
cT = 0;
res = 0;
}
else
{
rtbInfo.ReadOnly = false;
rtbInfo.Clear();
tbCount.Text = "All Notes Remove";
}
}
if (res == 0)
{
res = 33;
}
txtBoxMsg.Text = "Total of " + (135 - Count) + " can be entered & " + (5 - Lines) + " Lines";
tbMessage.Text = "Total of " + res + " more char can be entered on line " + Lines;
//tbCount.Text = "Count is " + Count + " cT " + cT + " res " + res;// For Testing
return;
}

I solved this using both TextChanged & KeyPress events
While that solution worked I decided to put all the code in a KeyPress event ONLY.
One HUGE mistake in my original question was in InitializeComponent
Look up and read when & how to use this method. Enjoy the Code
public partial class frmKPO : Form
{
int rtbTotLen;
int linesTot;
int lineNum;
int res1;
int count1;
int res2;
int count2;
int res3;
int count3;
int res4;
int count4;
public frmKPO()
{
InitializeComponent();
}
private void rtbInfo_KeyPress(object sender, KeyPressEventArgs e)
{
rtbTotLen = rtbInfo.TextLength;
linesTot = rtbInfo.Lines.Length;
lineNum = (5 - linesTot);
txtBoxMsg.Text = "Total of " + (135 - rtbTotLen) + " can be entered on " + (5 - lineNum) + " Lines";
if (e.KeyChar == (char)Keys.Back)
{
if (lineNum == 1)
{
--res1;
}
if (lineNum == 2)
{
--res2;
}
if (lineNum == 3)
{
--res3;
}
if (lineNum == 4)
{
--res4;
}
}
else
{
if (lineNum == 1)
{
++res1;
}
if (lineNum == 2)
{
++res2;
}
if (lineNum == 3)
{
++res3;
}
if (lineNum == 4)
{
++res4;
}
}
if (lineNum == 4)
{
count4 = 33 - res4;
tbMessage.Text = "Total of " + count4 + " more char can be entered on line " + (5 - lineNum) + "";
if (count4 == 0)
{
SendKeys.Send("{ENTER}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
}
}
else if (lineNum == 3)
{
count3 = 33 - res3;
tbMessage.Text = "Total of " + count3 + " more char can be entered on line " + (5 - lineNum) + "";
if (count3 == 0)
{
SendKeys.Send("{ENTER}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
}
}
else if (lineNum == 2)
{
count2 = 33 - res2;
tbMessage.Text = "Total of " + count2 + " more char can be entered on line " + (5 - lineNum) + "";
if (count2 == 0)
{
SendKeys.Send("{ENTER}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
}
}
else if (lineNum == 1)
{
count1 = 33 - res1;
tbMessage.Text = "Total of " + count1 + " more char can be entered on line " + (5 - lineNum) + "";
if (count1 == 0)
{
SendKeys.Send("{ENTER}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
}
}
if (linesTot == 5 | rtbTotLen == 135)
{
rtbInfo.ReadOnly = true;
}
if (rtbInfo.ReadOnly == true)
{
txtBoxMsg.Text = "";
tbMessage.Text = "";
tbCount.Text = "Use BACKSPACE Key to Edit";
}
if (rtbInfo.ReadOnly == true)
{
txtBoxMsg.Text = "";
tbMessage.Text = "";
tbCount.Text = "Use BACKSPACE Key to Edit";
string message = "Press YES to edit Notes" + '\n' + " NO Clear Notes";
string title = "Edit Notes";
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result = MessageBox.Show(message, title, buttons);
if (result == DialogResult.Yes)
{
rtbInfo.ReadOnly = false;
SendKeys.Send("{BACKSPACE}");
rtbInfo.ScrollToCaret();
rtbInfo.Focus();
}
else
{
rtbInfo.ReadOnly = false;
rtbInfo.Clear();
tbCount.Text = "All Notes Remove";
}
}
}
private void btnToStart_Click(object sender, EventArgs e)
{
Close();
frmStart fS = new frmStart();
fS.Show();
}
private void frmKPO_Load(object sender, EventArgs e)
{
ActiveControl = rtbInfo;
tbMessage.Text = "Total of " + 33 + " more char can be entered on line " + 1 + "";
}
}

Label not changing text in a hangman game c#

So im making a hangman gam3 it worked now im trying to make it w 2 players it aint working
He4e is the code for everybutton (letter)
When he clicks it
if (label13.Text == "Player 1 Guess")
{
if (Fullword.Contains(button2.Text))
{
char[] temp = Underscore_Word.ToCharArray();
char[] found = Fullword.ToCharArray();
for (int i = 0; i < found.Length; i++)
{
if (found[i] == button2.Text.ElementAt(0))
{
temp[i] = button2.Text.ElementAt(0);
}
}
Underscore_Word = new string(temp);
PrintLabel();
}
else
{
faux++;
}
if (faux < 7)
{
pictureBox1.Image = images[faux];
}
else
{
label1.Text = "you lose !!! ";
User.score--;
label7.Text = "Score of " + Methods.displayName + ": " + User.score.ToString();
label2.Visible = true;
label2.Text = "The word was :" + "\"" + Fullword + "\" ";
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "lose.wav";
player.Play();
}
if (Underscore_Word.Equals(Fullword))
{
label1.Text = "You Win!!";
User.score++;
label7.Text = "Score of " + Methods.displayName + ": " + User.score.ToString();
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "appllaud.wav";
player.Play();
}
label13.Text = "Player 2 Guess";
else
{
if (Fullword.Contains(button2.Text))
{
char[] temp = Underscore_Word.ToCharArray();
char[] found = Fullword.ToCharArray();
for (int i = 0; i < found.Length; i++)
{
if (found[i] == button2.Text.ElementAt(0))
{
temp[i] = button2.Text.ElementAt(0);
}
}
Underscore_Word = new string(temp);
PrintLabel();
}
else
{
faux_player2++;
}
if (faux_player2 < 7)
{
pictureBox2.Image = images[faux_player2];
}
else
{
label1.Text = "you lose !!! ";
User.score--;
label14.Text = "Score of " + Methods.displayName_playertwo + ": " + User.score_Player2.ToString();
label2.Visible = true;
label2.Text = "The word was :" + "\"" + Fullword + "\" ";
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "lose.wav";
player.Play();
}
if (Underscore_Word.Equals(Fullword))
{
label1.Text = "You Win!!";
User.score_Player2++;
label14.Text = "Score of " + Methods.displayName_playertwo + ": " + User.score_Player2.ToString(); ;
System.Media.SoundPlayer player = new System.Media.SoundPlayer();
player.SoundLocation = "appllaud.wav";
player.Play();
}
label13.Text = "Player 1 Guess";
}
im having problems with the label its staying player 1 guess its alternating when the player gets a wrong guess please help

You are messing a } after the label13.Text = "Player 2 Guess"; before the else
if (label13.Text == "Player 1 Guess")
{
// code ....
}
else
{
// code ....
}
I would also Advice you to try to write cleaner code and try to not repeat yourself.

For loop wait untill other task is complete

My problem is that I have this upload queue, and when I'm putting x number amount of files in the queue it only shows me the last file because the for loop goes around too fast.
for (i = 0; i < uploadFileList.Count; i++)
{
if (percentage == 100)
{
projects_tab.IsEnabled = true;
wait_for_upload_text.Visibility = Visibility.Hidden;
ModelUploadTXT.Text = "Upload done!";
FooterProgressBar.Value = 0;
FooterProgressBar.Foreground = Brushes.LimeGreen;
cancel_upload_model_button.Visibility = Visibility.Hidden;
SelectedFileText.Text = "Choose model(s) to import!";
try
{
uploadClient.Dispose();
}
catch (Exception asd)
{
}
}
else
{
choosedProjetName = uploadFileList[i];
ShowHome();
cancel_upload_model_button.Visibility = Visibility.Visible;
ModelUploadTXT.Text = "Uploading " + choosedProjetName + FooterProgressBar.Value.ToString("f0") + " % " + (bytesIn / 1000000).ToString("f2") + "Mb /" + (totalBytes / 1000000).ToString("f2") + "Mb";
FooterProgressBar.Foreground = Brushes.Orange;
}
}
I've tried to use
Task.Delay(1)
System.Theading.Thread.Sleep(1)
to work it around, but they haven't worked. So what I basically need is to wait percentage to go 100 and then go to next index.

Try using While condition to hold the code.
for (i = 0; i < uploadFileList.Count; i++)
{
choosedProjetName = uploadFileList[i];
ShowHome();
cancel_upload_model_button.Visibility = Visibility.Visible;
ModelUploadTXT.Text = "Uploading " + choosedProjetName + FooterProgressBar.Value.ToString("f0") + " % " + (bytesIn / 1000000).ToString("f2") + "Mb /" + (totalBytes / 1000000).ToString("f2") + "Mb";
FooterProgressBar.Foreground = Brushes.Orange;
while (percentage < 100)
{
continue;
}
projects_tab.IsEnabled = true;
wait_for_upload_text.Visibility = Visibility.Hidden;
ModelUploadTXT.Text = "Upload done!";
FooterProgressBar.Value = 0;
FooterProgressBar.Foreground = Brushes.LimeGreen;
cancel_upload_model_button.Visibility = Visibility.Hidden;
SelectedFileText.Text = "Choose model(s) to import!";
try
{
uploadClient.Dispose();
}
catch (Exception asd)
{
}
}

Button unable to click when Thread.Sleep

I understand that when Thread.Sleep is being executed, the buttons on my GUI are not able to be clicked on.
Is there any other ways to delay my codes from flowing yet still able to click on my buttons on the GUI?
For example right now after my codes execute Thread.Sleep(10000); and within this 10 seconds i'm not able to click on my button1 event, is there anyway that I can still click on my button1 event within these 10 seconds?
private void displaydata_event2(object sender, EventArgs e)
{
txt_data.AppendText(in_data + "\n");
string inStr;
inStr = in_data;
//MessageBox.Show(inStr.Length.ToString());
if (inStr.Length == 12)
{
int indexOfSpace = inStr.IndexOf(' ');
string Patient = inStr.Substring(indexOfSpace + 1);
int rx = 0;
int selected = 0;
txtData1.Text = Patient;
rx = Convert.ToInt16(Patient);
selected = Convert.ToInt16(txt_pnorec.Text);
if (rx != selected)
{
MessageBox.Show("Please check patient settings");
}
}
else if (inStr.Length == 24)
{
label2.Text = "Patient is not selected!";
label2.BackColor = Color.Red;
}
else if (inStr.Length == 10)
{
int indexOfSpace = inStr.IndexOf(':');
string Temp = inStr.Substring(indexOfSpace + 1);
txtData2.Text = Temp;
double tempflo;
tempflo = Convert.ToDouble(Temp);
if (tempflo > 20)
{
lbl_temp.Text = "Fever";
lbl_temp.BackColor = Color.Red;
}
}
else if (inStr.Length == 9)
{
int indexOfSpace = inStr.IndexOf(':');
string ECG = inStr.Substring(indexOfSpace + 1);
txtData3.Text = ECG;
}
else if (inStr.Length == 19 || inStr.Length == 20)
{
int indexOfSpace = inStr.IndexOf(':');
string Systolic = inStr.Substring(indexOfSpace + 1);
txtData4.Text = Systolic;
}
else if (inStr.Length == 21 || inStr.Length == 22)
{
int indexOfSpace = inStr.IndexOf(':');
string Diastolic = inStr.Substring(indexOfSpace + 1);
txtData5.Text = Diastolic;
}
else if (inStr.Length == 16)
{
int indexOfSpace = inStr.IndexOf(':');
string Pulse = inStr.Substring(indexOfSpace + 1);
txtData6.Text = Pulse;
}
else if (inStr.Length == 23 || inStr.Length == 17 || inStr.Length == 27 || inStr.Length == 30 || inStr.Length == 35 || inStr.Length == 29)
{
lbl_bp.Text = inStr;//to display status of BP (Normal,prehypotension etc)
string bp;
bp = inStr;
if (bp.Length == 23 || bp.Length == 27 || bp.Length == 31 || bp.Length == 35 || bp.Length == 30)
{
lbl_bp.BackColor = Color.Red;
}
else if (bp.Length == 17)
{
lbl_bp.BackColor = Color.LightGray;
}
}
else if (inStr.Length == 32 || inStr.Length == 25 || inStr.Length == 34 || inStr.Length == 33 || inStr.Length == 26 || inStr.Length == 31)
{
int indexOfSpace = inStr.IndexOf(':');
string Acc = inStr.Substring(indexOfSpace + 1);
txtData7.Text = Acc;
string test = inStr;
if (test.Length == 25 || test.Length == 34 || test.Length == 33 || test.Length == 26)
{
label21.Text = "Check on patient!";
label21.BackColor = Color.Red;
}
else if (test.Length == 32)
{
label21.Text = "";
label21.BackColor = Color.LightGray;
}
}
else
{
}
if (txtData1.Text != "" && txtData2.Text != "" && txtData3.Text != "" && txtData4.Text != "" && txtData5.Text != "" && txtData6.Text != "" && txtData7.Text != "")
{
try
{
connection2.Open();
OleDbCommand command2 = new OleDbCommand();
command2.Connection = connection2;
command2.CommandText = "insert into MedicalRecord (PatientNumber,FirstName,LastName,IC,Temperature,ECG,Systolic,Diastolic,Pulse) values('" + txt_pnorec.Text + "','" + txt_fnamerec.Text + "','" + txt_lnamerec.Text + "','" + txt_icrec.Text + "','" + txtData2.Text + "','" + txtData3.Text + "','" + txtData4.Text + "','" + txtData5.Text + "','" + txtData6.Text + "')";
command2.ExecuteNonQuery();
MessageBox.Show("Info Stored");
connection2.Close();
txtData1.Text = "";
txtData2.Text = "";
txtData3.Text = "";
txtData4.Text = "";
txtData5.Text = "";
txtData6.Text = "";
txtData7.Text = "";
Thread.Sleep(interval);
MessageBox.Show("Start");
}
catch (Exception ex)
{
MessageBox.Show("Error: " + ex);
}
txtData1.Text = "";
txtData2.Text = "";
txtData3.Text = "";
txtData4.Text = "";
txtData5.Text = "";
txtData6.Text = "";
txtData7.Text = "";
}
}
Thanks in advance.

There are multiple ways to achieve this. One example is to use a task with a delay:
Task.Delay(10000).ContinueWith(x =>
{
//Place the code you want delayed here.
});
Another example could be to use a BackgroundWorker which is made for this exact purpose.

you can use Async and Await
here is a good tutorial in combination with an GUI:
https://www.youtube.com/watch?v=MCW_eJA2FeY
you need to declare your function as async
public async void Foo()
{
...
}
than you can use:
await Task.Delay(10000);
it will release you GUI for the whole Delay and you can use your GUI while the Delay is waiting.

Task.Delay(10000).ContinueWith(x =>
{
//...
});
Have a look at Task.Delay and ContinueWith.

You can use Windows.Forms.Timer to execute something after delay... (with no UI thread freezing). Split your code on two parts. 1. Before delay 2. After delay
public partial class form1 : Form
{
// i used namespace to ensure that we use 'correct' Timer and we do not
// confuse it with System.Timers.Timer or System.Threading.Timer
System.Windows.Forms.Timer tmrDelay;
void SomeMethodWithDelay()
{
// code before delay here
tmrDelay.Enabled = true;
tmrDelay.Tick += Timer_Tick;
}
private void Timer_Tick(object sender, EventArgs e)
{
Thread.Sleep(5000);
// your code here
// disables timer to stop it
tmrDelay.Enabled = false;
}
}
Benefit from using Timer is that it is a native windows forms tool that was specially designed to help with this kind of problems.
However you can still use modern things like Tasks, for example : Task.Factory.StartNew(() => { Thread.Sleep(5000); // your method logic here });

resetting a dropdown combobox c#

I've created a form that allows for seat booking it has two dropdown menus and a label that changes showing them what seats they have booked. the label resets when I press the reset button but the drop down menus don't, they stay on the selected seats e.g. one menu saying "A" and the other saying "4" I need these to reset to blank can anyone help?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace courseworkTask3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
if (comboBox1.SelectedIndex <= 0)
{
button1.Enabled = false;
}
else
{
button1.Enabled = true;
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
string temp = comboBox1.Text;
int dropBox1enter;
if (int.TryParse(temp, out dropBox1enter))
{
}
int i = 0;
int seatsFound = 0;
int maxFoundSeats = 0;
int maxFoundSeatsStart = 0;
int maxFoundSeatsEnd = 0;
bool[] rowA = new bool[10];
rowA[0] = true;
rowA[1] = true;
rowA[2] = false;
rowA[3] = false;
rowA[4] = false;
rowA[5] = true;
rowA[6] = true;
rowA[7] = false;
rowA[8] = false;
rowA[9] = false;
bool[] rowB = new bool[10];
rowB[0] = true;
rowB[1] = false;
rowB[2] = false;
rowB[3] = false;
rowB[4] = false;
rowB[5] = true;
rowB[6] = true;
rowB[7] = false;
rowB[8] = false;
rowB[9] = false;
bool[] rowC = new bool[10];
rowC[0] = true;
rowC[1] = false;
rowC[2] = false;
rowC[3] = false;
rowC[4] = false;
rowC[5] = true;
rowC[6] = true;
rowC[7] = false;
rowC[8] = false;
rowC[9] = false;
bool[] rowD = new bool[10];
rowD[0] = true;
rowD[1] = false;
rowD[2] = false;
rowD[3] = false;
rowD[4] = false;
rowD[5] = true;
rowD[6] = true;
rowD[7] = false;
rowD[8] = false;
rowD[9] = false;
bool[] rowE = new bool[10];
rowE[0] = true;
rowE[1] = false;
rowE[2] = false;
rowE[3] = false;
rowE[4] = false;
rowE[5] = true;
rowE[6] = true;
rowE[7] = false;
rowE[8] = false;
rowE[9] = false;
if (comboBox2.Text == "A")
{
while (i < 10 && maxFoundSeats < dropBox1enter)
{
if (rowA[i] == false)
{
seatsFound++;
if (seatsFound > maxFoundSeats)
{
maxFoundSeats = seatsFound;
maxFoundSeatsStart = 1 + i - seatsFound;
maxFoundSeatsEnd = i;
}
}
else
{
seatsFound = 0;
}
i++;
} if (maxFoundSeats == dropBox1enter)
{
label4.Text = "Booked for " + maxFoundSeats + " seat(s) in row A starting, seat " + maxFoundSeatsStart + " to seat " + maxFoundSeatsEnd + ".";
}
else
{
label4.Text = "The seats you have selected are unavailable. #The maximum available is " + maxFoundSeats + " in row A From " + maxFoundSeatsStart + " to " + maxFoundSeatsEnd + ".";
label4.Text = label4.Text.Replace("#", System.Environment.NewLine);
}
}
else
{
if (comboBox2.Text == "B")
{
while (i < 10 && maxFoundSeats < dropBox1enter)
{
if (rowB[i] == false)
{
seatsFound++;
if (seatsFound > maxFoundSeats)
{
maxFoundSeats = seatsFound;
maxFoundSeatsStart = 1 + i - seatsFound;
maxFoundSeatsEnd = i;
}
}
else
{
seatsFound = 0;
}
i++;
}
if (maxFoundSeats == dropBox1enter)
{
label4.Text = "Booked for " + maxFoundSeats + " seat(s) in row B starting, seat " + maxFoundSeatsStart + " to seat " + maxFoundSeatsEnd + ".";
}
else
{
label4.Text = "The seats you have selected are unavailable. #The maximum available is " + maxFoundSeats + " in row B From " + maxFoundSeatsStart + " to " + maxFoundSeatsEnd + ".";
label4.Text = label4.Text.Replace("#", System.Environment.NewLine);
}
}
else
{
if (comboBox2.Text == "C")
{
while (i < 10 && maxFoundSeats < dropBox1enter)
{
if (rowC[i] == false)
{
seatsFound++;
if (seatsFound > maxFoundSeats)
{
maxFoundSeats = seatsFound;
maxFoundSeatsStart = 1 + i - seatsFound;
maxFoundSeatsEnd = i;
}
}
else
{
seatsFound = 0;
}
i++;
}
if (maxFoundSeats == dropBox1enter)
{
label4.Text = "Booked for " + maxFoundSeats + " seat(s) in row C starting, seat " + maxFoundSeatsStart + " to seat " + maxFoundSeatsEnd + ".";
}
else
{
label4.Text = "The seats you have selected are unavailable. #The maximum available is " + maxFoundSeats + " in row C From " + maxFoundSeatsStart + " to " + maxFoundSeatsEnd + ".";
label4.Text = label4.Text.Replace("#", System.Environment.NewLine);
}
}
else
{
if (comboBox2.Text == "D")
{
while (i < 10 && maxFoundSeats < dropBox1enter)
{
if (rowD[i] == false)
{
seatsFound++;
if (seatsFound > maxFoundSeats)
{
maxFoundSeats = seatsFound;
maxFoundSeatsStart = 1 + i - seatsFound;
maxFoundSeatsEnd = i;
}
}
else
{
seatsFound = 0;
}
i++;
}
if (maxFoundSeats == dropBox1enter)
{
label4.Text = "Booked for " + maxFoundSeats + " seat(s) in row D starting, seat " + maxFoundSeatsStart + " to seat " + maxFoundSeatsEnd + ".";
}
else
{
label4.Text = "The seats you have selected are unavailable. #The maximum available is " + maxFoundSeats + " in row D From " + maxFoundSeatsStart + " to " + maxFoundSeatsEnd + ".";
label4.Text = label4.Text.Replace("#", System.Environment.NewLine);
}
}
else
{
if (comboBox2.Text == "E")
{
while (i < 10 && maxFoundSeats < dropBox1enter)
{
if (rowE[i] == false)
{
seatsFound++;
if (seatsFound > maxFoundSeats)
{
maxFoundSeats = seatsFound;
maxFoundSeatsStart = 1 + i - seatsFound;
maxFoundSeatsEnd = i;
}
}
else
{
seatsFound = 0;
}
i++;
}
if (maxFoundSeats == dropBox1enter)
{
label4.Text = "Booked for " + maxFoundSeats + " seat(s) in row E starting, seat " + maxFoundSeatsStart + " to seat " + maxFoundSeatsEnd + ".";
}
else
{
label4.Text = "The seats you have selected are unavailable. #The maximum available is " + maxFoundSeats + " in row E From " + maxFoundSeatsStart + " to " + maxFoundSeatsEnd + ".";
label4.Text = label4.Text.Replace("#", System.Environment.NewLine);
}
}
} //end E
} //end D
} //end C
}
}
private void dropBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void dropBox2_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.Text != null && comboBox2.Text != null)
{
button1.Enabled = true;
}
}
private void button2_Click(object sender, EventArgs e)
{
label4.Text = "";
}
}
}

As #Rohit Prakash pointed out in the comments to your question, setting the SelectedIndex of a ComboBox to -1 will reset any selections to the Combobox:
(I'm assuming "button2" is your Reset button, you should really name your controls more appropriately)
private void button2_Click(object sender, EventArgs e)
{
label4.Text = "";
comboBox1.SelectedIndex = -1;
comboBox2.SelectedIndex = -1;
}