แบบฝึกหัด

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 WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void get_text_Click(object sender, EventArgs e)

        {

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

      

        }

    }

}

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        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();
        }
    }
}

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 = "C:\\Documents and Settings\\Student\\Desktop\\picture\\016.jpg";

            image.Load();

        }

        private void delete_Click(object sender, EventArgs e)

        {

            image.Image = null;

        }

    }

}