//引入命名空间
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class Form1 : System.Windows.Forms.Form
{
    RichTextBox rtb = new RichTextBox();
    public Form1()
    {
        this.Controls.Add(rtb);
        rtb.Dock = DockStyle.Fill;
        this.InputLanguageChanged += new InputLanguageChangedEventHandler(languageChange);
    }
    private void languageChange(Object sender, InputLanguageChangedEventArgs e)
    {
        // If the input language is Japanese.
        // set the initial IMEMode to Katakana.
        if (e.InputLanguage.Culture.TwoLetterISOLanguageName.Equals("ja"))
        {
            rtb.ImeMode = System.Windows.Forms.ImeMode.Katakana;
        }
    }
    public static void Main(string[] args)
    {
        Application.Run(new Form1());
    }
}