Question

Write a C# Windows Forms App code in Visual studio with a "start", "stop", "up", "down", "left" and "right" buttons and a textbox.

The textbox should start printing numbers from 1 to 100 on the press of the "start" button and stop printing process immediately on the press of "stop" button.

Also create a thread after stop button is pressed to allow manual input from  "up", "down", "left" and "right" buttons and print up, down, left or right in the same textbox.

Answer 1

//form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PrintNumbers
{
public partial class Form1 : Form
{
static bool stop = false;
BackgroundWorker bgw;
String numbers = "";
public Form1()
{
InitializeComponent();
bgw = new BackgroundWorker();
bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
bgw.ProgressChanged += new ProgressChangedEventHandler(bgw_ProgressChanged);
bgw.WorkerReportsProgress = true;
bgw.WorkerSupportsCancellation = true;
}
private void bgw_DoWork(object sender, DoWorkEventArgs e)
{
stop = false;
PrintNumbers();
}
private void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
btnDown.Enabled = false;
btnLeft.Enabled = false;
btnRight.Enabled = false;
btnUp.Enabled = false;
NumTextbox.Refresh();
NumTextbox.Text = numbers;   
}

public void PrintNumbers()
{
int i = 1;
while(!stop)
{
numbers = numbers + (i).ToString();
bgw.ReportProgress(0);
Thread.Sleep(500);   
i++;
}
}

private void StopClk(object sender, EventArgs e)
{
stop = true;
btnDown.Enabled = true;
btnLeft.Enabled = true;
btnRight.Enabled = true;
btnUp.Enabled = true;
bgw.CancelAsync();
  
}

private void StartClk(object sender, EventArgs e)
{

bgw.RunWorkerAsync(); //call backgroundworker to handle task on click of start

}

private void btnUp_Click(object sender, EventArgs e)
{
NumTextbox.Text = btnUp.Text;

}

private void btnRight_Click(object sender, EventArgs e)
{
NumTextbox.Text = btnRight.Text;
}

private void btnLeft_Click(object sender, EventArgs e)
{
NumTextbox.Text = btnLeft.Text;
}

private void btnDown_Click(object sender, EventArgs e)
{
NumTextbox.Text = btnDown.Text;
}

}

}

//form1.designer.cs

namespace PrintNumbers
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

  
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.NumTextbox = new System.Windows.Forms.TextBox();
this.btnStart = new System.Windows.Forms.Button();
this.btnRight = new System.Windows.Forms.Button();
this.btnLeft = new System.Windows.Forms.Button();
this.btnDown = new System.Windows.Forms.Button();
this.btnUp = new System.Windows.Forms.Button();
this.btnStop = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// NumTextbox
//
this.NumTextbox.Location = new System.Drawing.Point(12, 12);
this.NumTextbox.Multiline = true;
this.NumTextbox.Name = "NumTextbox";
this.NumTextbox.Size = new System.Drawing.Size(260, 83);
this.NumTextbox.TabIndex = 0;
//
// btnStart
//
this.btnStart.Location = new System.Drawing.Point(36, 207);
this.btnStart.Name = "btnStart";
this.btnStart.Size = new System.Drawing.Size(75, 23);
this.btnStart.TabIndex = 1;
this.btnStart.Text = "START";
this.btnStart.UseVisualStyleBackColor = true;
this.btnStart.Click += new System.EventHandler(this.StartClk);
//
// btnRight
//
this.btnRight.Enabled = false;
this.btnRight.Location = new System.Drawing.Point(186, 138);
this.btnRight.Name = "btnRight";
this.btnRight.Size = new System.Drawing.Size(75, 23);
this.btnRight.TabIndex = 2;
this.btnRight.Text = "RIGHT";
this.btnRight.UseVisualStyleBackColor = true;
this.btnRight.Click += new System.EventHandler(this.btnRight_Click);
//
// btnLeft
//
this.btnLeft.Enabled = false;
this.btnLeft.Location = new System.Drawing.Point(24, 138);
this.btnLeft.Name = "btnLeft";
this.btnLeft.Size = new System.Drawing.Size(75, 23);
this.btnLeft.TabIndex = 3;
this.btnLeft.Text = "LEFT";
this.btnLeft.UseVisualStyleBackColor = true;
this.btnLeft.Click += new System.EventHandler(this.btnLeft_Click);
//
// btnDown
//
this.btnDown.Enabled = false;
this.btnDown.Location = new System.Drawing.Point(105, 167);
this.btnDown.Name = "btnDown";
this.btnDown.Size = new System.Drawing.Size(75, 23);
this.btnDown.TabIndex = 4;
this.btnDown.Text = "DOWN";
this.btnDown.UseVisualStyleBackColor = true;
this.btnDown.Click += new System.EventHandler(this.btnDown_Click);
//
// btnUp
//
this.btnUp.Enabled = false;
this.btnUp.Location = new System.Drawing.Point(105, 120);
this.btnUp.Name = "btnUp";
this.btnUp.Size = new System.Drawing.Size(75, 23);
this.btnUp.TabIndex = 5;
this.btnUp.Text = "UP";
this.btnUp.UseVisualStyleBackColor = true;
this.btnUp.Click += new System.EventHandler(this.btnUp_Click);
//
// btnStop
//
this.btnStop.Location = new System.Drawing.Point(175, 207);
this.btnStop.Name = "btnStop";
this.btnStop.Size = new System.Drawing.Size(75, 23);
this.btnStop.TabIndex = 6;
this.btnStop.Text = "STOP";
this.btnStop.UseVisualStyleBackColor = true;
this.btnStop.Click += new System.EventHandler(this.StopClk);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(284, 262);
this.Controls.Add(this.btnStop);
this.Controls.Add(this.btnUp);
this.Controls.Add(this.btnDown);
this.Controls.Add(this.btnLeft);
this.Controls.Add(this.btnRight);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.NumTextbox);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();

}

#endregion

private System.Windows.Forms.TextBox NumTextbox;
private System.Windows.Forms.Button btnStart;
private System.Windows.Forms.Button btnRight;
private System.Windows.Forms.Button btnLeft;
private System.Windows.Forms.Button btnDown;
private System.Windows.Forms.Button btnUp;
private System.Windows.Forms.Button btnStop;
}
}