แบบฝึกหัด

โปรแกรมที่ 12.1

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 WindowsFormsApplication9

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void get_text_Click(object sender, EventArgs e) {

            MessageBox.Show(messageText.Text, "Output");

        }

    }

}

โปรแกรมที่ 12.2

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 WindowsFormsApplication10

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void add_Click(object sender, EventArgs e)  {

            Int32 A, B, X;

            A = Convert.ToInt32(input_A.Text);

            B = Convert.ToInt32(input_B.Text);

            X = A + B;

            output.Text = X.ToString();

        }

    }

}

โปรแกรมที่12.3

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 Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void show_Click(object sender, EventArgs e)
        {
            image.ImageLocation = "D:\\5321414186_nuy\\pic1.jpg";
            image.Load();   //โหลดภาพขึ้นมาแสดงผล
        }

        private void delete_Click(object sender, EventArgs e)
        {
            image.Image = null;  //กำหนดคุณสมบัติโดยให้ค่า Image เป็น nill
        }
    }
}