Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "CaptureScreenshot" and then click OK
Step 2: Design your form as below

Step 3: Add code to handle your form as below
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 CaptureScreenshot
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btnCapture_Click(object sender, EventArgs e)
{
Bitmap bm = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g = Graphics.FromImage(bm);
g.CopyFromScreen(0, 0, 0, 0, bm.Size);
pictureBox.Image = bm;
}
//Capture screenshot
void Capture()
{
while (true)
{
Bitmap bm = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g = Graphics.FromImage(bm);
g.CopyFromScreen(0, 0, 0, 0, bm.Size);
pictureBox.Image = bm;
Thread.Sleep(1000);
}
}
private void btnRecord_Click(object sender, EventArgs e)
{
//Start new thread to record your screen
Thread t = new Thread(Capture);
t.Start();
}
}
}
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