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C# Windows Form - Problem input validation Calculator

I am having a little problem with validation on my calculator, I would like when I press enter or all other characters except numbers ,it would notify me of an error.
Basically, I would like that when I type a letter or special character with the keyboard I get an error returned
I am using windows form, I attach below my code:
double num1;
double num2;
double result;
String oper = "+";
private void button_minus_Click(object sender, EventArgs e)
{
// label1.Text += minus_click.Text;
num1 = double.Parse(label1.Text);
oper = "-";
label1.Text += oper;
label1.Text = "";
}
private void button1_Click(object sender, EventArgs e)
{
label1.Text += button15.Text;
}
private void button16_Click(object sender, EventArgs e)
{
label1.Text += button16.Text;
}
private void button5_Click(object sender, EventArgs e)
{
label1.Text += button5.Text;
}
private void button4_Click(object sender, EventArgs e)
{
label1.Text += button4.Text;
}
private void button6_Click(object sender, EventArgs e)
{
label1.Text += division_click.Text;
}
private void button4_Click_1(object sender, EventArgs e)
{
}
private void button10_Click(object sender, EventArgs e)
{
}
private void button6_Click_1(object sender, EventArgs e)
{
}
private void button7_Click(object sender, EventArgs e)
{
label1.Text += button7.Text;
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
}
private void label1_Click(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button_AC_Click(object sender, EventArgs e)
{
label1.Text = String.Empty;
label3.Text = String.Empty;
}
private void button2_Click_1(object sender, EventArgs e)
{
label1.Text += button16.Text;
}
private void button3_Click_1(object sender, EventArgs e)
{
label1.Text += button17.Text;
}
private void button7_Click_1(object sender, EventArgs e)
{
label1.Text += button7.Text;
}
private void button8_Click(object sender, EventArgs e)
{
label1.Text += button8.Text;
}
private void button9_Click(object sender, EventArgs e)
{
label1.Text += button9.Text;
}
private void button11_Click_1(object sender, EventArgs e)
{
label1.Text += button11.Text;
}
private void button12_Click(object sender, EventArgs e)
{
label1.Text += button12.Text;
}
private void button13_Click(object sender, EventArgs e)
{
label1.Text += button6.Text;
}
private void buttonPoint_Click(object sender, EventArgs e)
{
label1.Text += buttonPoint.Text;
num1 = (double)Convert.ToDecimal(label1.Text);
num2 = (double)Convert.ToDecimal(label1.Text);
}
private void button10_Click_1(object sender, EventArgs e)
{
label1.Text += moltiplication_click.Text;
}
private void button18_Click(object sender, EventArgs e)
{
label1.Text += addiction_click.Text;
}
private void button3_Click(object sender, EventArgs e)
{
label1.Text += button3.Text;
}
private void button5_Click_1(object sender, EventArgs e)
{
label1.Text += button5.Text;
}
private void Form1_Load_1(object sender, EventArgs e)
{
}
private void panel1_Paint_1(object sender, PaintEventArgs e)
{
}
private void label3_Click(object sender, EventArgs e)
{
}
private void addiction_click_Click(object sender, EventArgs e)
{
//label1.Text += addiction_click.Text;
num1 = double.Parse(label1.Text);
oper = "+";
label1.Text = string.Empty;
label3.Text = String.Empty;
}
private void moltiplication_click_Click(object sender, EventArgs e)
{
//label1.Text += moltiplication_click.Text;
num1 = double.Parse(label1.Text);
oper = "*";
label1.Text += oper;
label1.Text = "";
label3.Text = String.Empty;
}
private void division_click_Click(object sender, EventArgs e)
{
num1 = double.Parse(label1.Text);
oper = "/";
label1.Text += oper;
label1.Text = "";
label3.Text = String.Empty;
}
private void buttonPIùOMENO_Click_2(object sender, EventArgs e)
{
num1 = double.Parse(label1.Text);
}
private void buttonPERCENTUAL_Click_2(object sender, EventArgs e)
{
//num1 = (double)Convert.ToDecimal(label1.Text);
oper = "%";
label1.Text += oper;
label3.Text = String.Empty;
}
private void button3_Click_0(object sender, EventArgs e)
{
label1.Text += button3.Text;
}
private void equals_click_Click(object sender, EventArgs e)
{
num2 = Convert.ToInt32(label1.Text);
label1.Text = label1.Text;
switch (oper)
{
case "+":
result = num1 + num2;
label3.Text = Convert.ToString(result);
break;
case "-":
result = num1 - num2;
label3.Text = Convert.ToString(result);
break;
case "*":
result = num1 * num2;
label3.Text = Convert.ToString(result);
break;
case "/":
result = num1 / num2;
label3.Text = Convert.ToString(result);
break;
case "%":
num2 = (double)Convert.ToDecimal(label3.Text);
result = num1 % num2;
label3.Text = result.ToString();
break;
}
label3.Text = result.ToString();
}
private void label1_Click_1(object sender, EventArgs e)
{
}
public bool ValidationEmptyNumber(String s)
{
bool isNumber = true;
while (isNumber)
{
label1.Text = num1.ToString();
label1.Text = num2.ToString();
return isNumber = true;
if (label1.Text == String.Empty)
{
MessageBox.Show("please enter a number");
return isNumber = false;
}
}
}
public bool ValidationOnlyNumbers(String s) {
bool isNumber;
Regex regex = new Regex("[a-zA-Z]+");
Match match = regex.Match("impossible to insert letters or special characters");
while (isNumber = true)
{
label1.Text = num1.ToString();
label1.Text = num2.ToString();
return isNumber;
if (match.Success)
{
label1.Text = match.Value;
MessageBox.Show(match.Value);
}
{
}
}
{
}
}
}
}

Customization censored in textBox

I have problem, which consists in aesthetic sense, correctly - There is textBox to which i apply true condition of UseSystemPasswordChar.. It's work! But i get bold points. Try to change font size - decreases textbox's field. Below is the code (although why is it here?). Can anyone help, thank you in advance)
public partial class frmRegistr : Form
{
public frmRegistr()
{
InitializeComponent();
}
int counter = 0;
int a = 0;
string b;
private void frmRegistr_Load(object sender, EventArgs e)
{
b = label1.Text;
a = b.Length;
label1.Text = "";
timer1.Start();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void label2_Click(object sender, EventArgs e)
{
}
private void timer1_Tick(object sender, EventArgs e)
{
if (counter < a)
{
counter++;
label1.Text = b.Substring(0, counter);
}
else
{
timer1.Stop();
}
}
private void label4_Click(object sender, EventArgs e)
{
timer3.Start();
}
private void label4_MouseHover(object sender, EventArgs e)
{
//if this.MouseLeave
label4.BackColor = Color.FromArgb(((int)(((byte)(154)))), ((int)(((byte)(181)))), ((int)(((byte)(101)))));
}
private void timer2_Tick(object sender, EventArgs e)
{
if (Opacity == 1)
{
timer2.Stop();
}
Opacity += .2;
}
private void timer3_Tick(object sender, EventArgs e)
{
if (Opacity <= 0)
{
this.Close();
}
Opacity -= .2;
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
textBox2.UseSystemPasswordChar = true;
}
}
}

If you want to define your own password character, use property TextBox.PasswordChar. If you want this in a certain font, use Control.Font
As you only have to do this once, do this in the constructor:
public MyForm : Form
{
InitializeComponents(),
this.textBox1.PasswordChar = '_';
this.textBox11.Font = new Font(...)
};
You can also decide to do this using the visual studio designer.

You can setup this in VisualStudio designer, but this is code:
textBox1.PasswordChar = '*';
//* = password character

Calling a text box value when the progress bar finishes

I am new to C#.
Just doing my first project.
This is my code.
I just want to fill the textbox once the progress bar finish loading.
But its not working now.
Can anyone tell me what I am doing worong.
My code is as below.
private void button1_Click(object sender, EventArgs e)
{
this.timer1.Start();
// int n = timer1.Interval;
int m = progressBar1.Value;
if(m==0)
{
textBox2.Text = "test";
}
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void timer1_Tick(object sender, EventArgs e)
{
this.progressBar1.Increment(1);
}
}

Try This:
int progressVal=0;
private void button1_Click(object sender, EventArgs e)
{
this.timer1.Start();
// int n = timer1.Interval;
}
private void timer1_Tick(object sender, EventArgs e)
{
this.progressBar1.Increment(1);
progressVal= progressBar1.Value;
if(progressVal==progressBar1.Maximum)
{
timer1.Stop();
textBox2.Text = "Loading done!";
}
}

MouseDown Event and Progress Bar

I would like to have a progress bar, where the value of the bar would rise if the button was being pressed down(MouseDown Event), the bar needs to rise simultaneousely.
Any ideas? I tried with a timer but this is all I have currently
private void button1_Click(object sender, EventArgs e)
{
progressBar1.PerformStep();
progressBar1.UseWaitCursor = true;
}
private void button2_Click(object sender, EventArgs e)
{
progressBar1.Value = 0;
}
public void button1_MouseDown(object sender, MouseEventArgs e)
{
timer1.Start();
}
public void button1_MouseUp(object sender, MouseEventArgs e)
{
timer1.Stop();
}
private void timer1_Tick(object sender, EventArgs e)
{
}

It should look like this:
void timer_Tick(object sender, EventArgs e) {
progressBar1.PerformStep();
}
void button1_MouseDown(object sender, MouseEventArgs e) {
timer.Start();
}
void button1_MouseUp(object sender, MouseEventArgs e) {
timer.Stop();
}

The following program will update the progress bar each 20 ms the mouse is held down and get 10 100% after 2 seconds
public partial class Form1 : Form
{
private Timer pbTimer;
private int pbProgress = 0;
public Form1()
{
InitializeComponent();
pbTimer = new Timer();
pbTimer.Tick += new EventHandler(ProgressUpdate);
pbTimer.Interval = 20;
this.MouseDown += Form1_MouseDown;
this.MouseUp += Form1_MouseUp;
}
private void ProgressUpdate(object sender, EventArgs e)
{
if (pbProgress < 100)
{
progressBar1.Value = ++pbProgress;
}
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
pbTimer.Start();
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
pbTimer.Stop();
progressBar1.Value = 0;
pbProgress = 0;
}

How can I add (append) a word to the same sentence, using one button (click) per word

I greatly appreciate any help. I have 20+ buttons, each with a word, or a space or period. Each time I click on a button, the pre-existing word is wiped out and replaced with the new word. I need each word and/or space to remain in place until I click the "Clear" button.
Maybe this has been previously asked/answered under different search terms? I tend to believe I need to identify a string variable, but have no idea how to begin.
==============
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 frmSentenceBuilder : Form
{
public frmSentenceBuilder()
{
InitializeComponent();
}
private void frmSentenceBuilder_Load(object sender, EventArgs e)
{
}
private void btnA_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnA.Text;
}
private void btn_a_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_a.Text;
}
private void btnAn_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnAn.Text;
}
private void btn_an_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_an.Text;
}
private void btnThe_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnThe.Text;
}
private void btn_the_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_the.Text;
}
private void btnman_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnman.Text;
}
private void btnwoman_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnwoman.Text;
}
private void btndog_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btndog.Text;
}
private void btncat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btncat.Text;
}
private void btncar_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btncar.Text;
}
private void btnbicycle_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbicycle.Text;
}
private void btnbeautiful_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbeautiful.Text;
}
private void btnbig_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbig.Text;
}
private void btnsmall_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnsmall.Text;
}
private void btnstrange_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnstrange.Text;
}
private void btnlookedat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnlookedat.Text;
}
private void btnrode_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnrode.Text;
}
private void btnspoketo_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnspoketo.Text;
}
private void btnlaughedat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnlaughedat.Text;
}
private void btndrove_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btndrove.Text;
}
private void btnSpace_Click(object sender, EventArgs e)
{
lblSentenceText.Text = " ";
}
private void btnperiod_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnperiod.Text;
}
private void btnexclam_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnexclam.Text;
}
private void btnClear_Click(object sender, EventArgs e)
{
lblSentenceText.Text = "";
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
}
}

Use lb1SentenceText.Text+=whatever.Text;.
+= is equivalent to lbSentence.Text = lblSentenceText.Text + whatever.Text.
Basically, it appends or concatenates the right hand side string to the string on the left hand side. Hope it makes sense?
So:
string rhs="Hello " ;
string lhs = "World";
string rhs = rhs + lhs;//Hello World

Please be inspired. You have a lot of redundant code.
btnA.Click += AppendButtonText;
btn_a.Click += AppendButtonText;
...
private void AppendButtonText(object sender, EventArgs e)
{
var button = sender as Button;
if (button != null)
{
lblSentenceText.Text += button.Text;
}
}

On the button click events, change it to += instead of = (except in the clear button). This is equivalent to writing something = something + newValue;.

Try:
lb1SentenceText.Text = lb1SentenceText.Text + *something*.text
The += operator means add to, and the variable modified is equal to the added (Int, String) appended to the original value (x = 1; x += 3; x is now 4)
Try this:
button.Click += new System.EventHandler(ButtonClick);
button1.Click += new System.EventHandler(ButtonClick);
// And for each button, one of those.
private void ButtonClick(object sender, System.EventArgs e)
{
// Do whatever you want to do here, you can place the TEXT to be appended on the button, if so:
lb1SentenceText.Text += sender.Text;
}

//Simple.Create a global variable and within each button click event do this;
string yourStrVar = ""; //Must be global
yourStrVar+= ((Button)sender).Text