c#,winform,UserContrl,用户控件开发，窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace WindowsControlLibrary1
{
    public partial class UserControl1 : UserControl
    {
        public event EventHandler AddressLine1Changed;
        public event EventHandler AddressLine2Changed;
        public event EventHandler ZoneChanged;
        public event EventHandler NumberChanged;

        private void TextBoxControls_TextChanged(object sender, EventArgs e)
        {
            switch (((TextBox)sender).Name)
            {
                case "txtAddress1":
                    if (AddressLine1Changed != null)
                    {
                        AddressLine1Changed(this, EventArgs.Empty);
                    }
                    break;
                case "txtAddress2":
                    if (AddressLine2Changed != null)
                        AddressLine2Changed(this, EventArgs.Empty);
                    break;
                case "txtZone":
                    if (ZoneChanged != null)
                        ZoneChanged(this, EventArgs.Empty);
                    break;
                case "txtNumber":
                    if (NumberChanged != null)
                        NumberChanged(this, EventArgs.Empty);
                    break;
            }
        }
        [Category("NumberData"), DescriptionAttribute("Gets or sets the Number value"), DefaultValue("")]
        public string Number
        {
            get { return this.txtNumber .Text; }
            set
            {
                if (txtNumber.Text != value)
                {
                    txtNumber.Text = value;
                    if (NumberChanged != null)
                        NumberChanged(this, PropertyChangedEventArgs.Empty);
                }
            }
        }
        [Category("AddressData"), DescriptionAttribute("Gets or sets the AddressLine1 value"), DefaultValue("")]
        public string AddressLine1
        {
            get { return txtAddress1.Text; }
            set
            {
                if (txtAddress1.Text != value)
                {
                    txtAddress1.Text = value;
                    if (AddressLine1Changed != null)
                        AddressLine1Changed(this, PropertyChangedEventArgs.Empty);
                }
            }
        }
        [Category("AddressData"), DescriptionAttribute("Gets or sets the AddressLine2 value"), DefaultValue("")]
        public string AddressLine2
        {
            get { return txtAddress2.Text; }
            set
            {
                if (txtAddress2.Text != value)
                {
                    txtAddress2.Text = value;
                    if (AddressLine2Changed != null)
                        AddressLine2Changed(this, PropertyChangedEventArgs.Empty);
                }
            }
        }
        [Category("ZoneData"), DescriptionAttribute("Gets or sets the Zone value"), DefaultValue("")]
        public string Zone
        {
            get { return txtZone.Text; }
            set
            {
                if (txtZone.Text != value)
                {
                    txtZone.Text = value;
                    if (ZoneChanged!= null)
                        ZoneChanged(this, PropertyChangedEventArgs.Empty);
                }
            }
        }
        
        
        public UserControl1()
        {
            InitializeComponent();
        }
    }
}