แบบฝึกหัด

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");

        }

    }

}

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 add_Click(object sender, EventArgs e)

        {

            Int32 A,B,X;

            A = Convert.ToInt32(input_A.Text); //เปลี่ยนข้อมูลเป็นตัวเลข

            B = Convert.ToInt32(input_B.Text); //เปลี่ยนข้อมูลเป็นตัวเลข

            X = A + B;

            output.Text=X.ToString(); //เปลี่ยนตัวเลขเป็นสตริงแล้วแสดงผล

        }

    }

}



โปรแกรมที่ 12.3

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:\\5321404077_pai\\pic1.jpg";
            image.Load();  
        }


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