Create a soft keyboard

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 keyboardDemo
{
    public partial class Form1 : Form
    {

        /// <summary>
        /// 涂聚文
        /// 软键盘http://code.msdn.microsoft.com/CSSoftKeyboard-0a86f914
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 f = new Form2();
            f.Press += MiniKeyboardHandler;
            f.ShowDialog();
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MiniKeyboardHandler(object sender, MiniKeyboardArgs e)
        {
            if (this.textBox1.Text == "←backpspace")
            {
                if (this.textBox1.Text.Length != )
                {

                }

            }
            else
            {
                textBox1.Text += e.KeyCode;
                string s = this.textBox1.Text;
                if (s.Contains("←backpspace"))//去除一个字符串
                {
                    s = s.Replace("←backpspace", "");
                    if (s.Length > )
                    {
                        s = s.Substring(, s.Length - );
                        this.textBox1.Text = s;
                    }
                    else
                    {
                        this.textBox1.Text = s;
                    }
                }

            }

        }
    }
}

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 keyboardDemo
{
    public partial class Form2 : Form
    {
        bool isShift = true;
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public delegate void MiniKeyboardHandler(object sender, MiniKeyboardArgs e);
        /// <summary>
        ///
        /// </summary>
        public event MiniKeyboardHandler Press;

        /// <summary>
        ///
        /// </summary>
        private void BindEvent()
        {
            foreach (Control ctl in this.Controls)
            {
                if (ctl is Button)
                    ctl.Click += MinikeyboardPress;
            }
        }
        /// <summary>
        ///
        /// </summary>
        public Form2()
        {
            InitializeComponent();
            BindEvent();
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form2_Load(object sender, EventArgs e)
        {

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void MinikeyboardPress(object sender, EventArgs e)
        {
            //大小写
            if (((Button)sender).Text == "Shift")
            {
                if (isShift == true)
                {
                    isShift = false;
                    string s = this.button1.Text;
                    s = s.ToUpper();
                    this.button1.Text = s;
                }
                else
                {
                    isShift = true;
                    string s = this.button1.Text;
                    s = s.ToLower();
                    this.button1.Text = s;
                }
            }
            else
            {
                OnMiniKeyboardHandle(new MiniKeyboardArgs(((Button)sender).Text));
            }

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="e"></param>
        private void OnMiniKeyboardHandle(MiniKeyboardArgs e)
        {
            MiniKeyboardHandler temp = Press;
            if (temp != null)
                temp(this, e);
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button6_Click(object sender, EventArgs e)
        {
            //if (isShift == true)
            //{
            //    isShift = false;
            //    this.button1.Text.ToUpper();
            //}
            //else
            //{
            //    isShift = true;
            //}
        }
    }

    /// <summary>
    ///
    /// </summary>
    public class MiniKeyboardArgs : EventArgs
    {
        public string KeyCode { get; private set; }

        public MiniKeyboardArgs(string code)
        {
            if (code == "←backpspace")
            {
                if (code.Length != )
                {
                    KeyCode = code;
                }
                else
                {
                    KeyCode = code;
                    //KeyCode = "";Caps Lock
                }
            }
            else if (code == "Shift")
            {
                KeyCode = "";

            }
            else if (code == "Caps Lock")
            {
                KeyCode = "";

            }
            else
            {
                KeyCode = code;
            }
        }
    }

}

        /// <summary>
        ///
        /// </summary>
        public Form1()
        {
            InitializeComponent();
            //在TEXTBOX控件中加一个按钮控件，如QQ软键盘一样的图标
            this.textBox1.Controls.Add(DropButton);
            DropButton.Location = new Point(this.textBox1.Width - , );

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DropButton_Click(object sender, EventArgs e)
        {
            //MessageBox.Show("erro");
            Form2 f = new Form2();
            f.StartPosition = FormStartPosition.Manual;//窗体位置设置
            f.Location = new Point(this.Location.X /  + this.textBox1.Location.X + , this.Location.Y /  + this.textBox1.Height + this.Height / +);//位置设置
            f.Press += MiniKeyboardHandler;
            f.ShowDialog();

        }