我用C＃写了一个自定义登录控件，增加了事件响应机制 但点击登录或重置控件时事件却无响应，到底哪里错了？以下是自定义控件代码
using System;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.Security;
namespace kongjian
{
/// <summary>
/// LoginCustomControl 的摘要说明。
/// </summary>
[DefaultProperty( "Text "),
DefaultEvent( "ItemChanged "), //双击响应
ParseChildren(true),
Description( "Login Control "),
Designer(typeof(kongjian.LoginControlDesigner)),//指定了登录控件的设计器类
ToolboxData( " <{0}:LoginCustomControl runat=server> </{0}:LoginCustomControl> ")]
public class LoginCustomControl : System.Web.UI.WebControls.WebControl
{
public static string USERNAME_STRING = "用户名: ";
public static string PASSWORD_STRING = "密  码: ";//两个字中间留空格
public static string LOGIN_STRING = "登录 ";
public static string RESET_STRING = "重置 ";
public static string CAPTION_STRING = "用户登录 ";
public static string REGISTER_STRING = "注册新用户 ";

private TextBox tbUserName;
private TextBox tbPassword;
private Button btnLogin;
private Button btnReset;
private LiteralControl vUserName;
private LiteralControl vPassword;
private LinkButton lbRegister;
private bool _show_register;

public event EventHandler Login;
public event EventHandler Reset;
public event EventHandler Register;

protected void OnLogin(EventArgs e)
{
if (Login != null)
{
Login(this, e);
}
}

protected void OnReset(EventArgs e)
{
if (Reset != null)
{
Reset(this, e);
}
}

protected void OnRegister(EventArgs e)
{
if (Register != null)
{
Register(this, e);
}
}

public string UserName
{
get
{
this.EnsureChildControls();
return tbUserName.Text;
}
set
{
this.EnsureChildControls();
tbUserName.Text = value;
}
}

public string Password
{
get
{
this.EnsureChildControls();
return tbPassword.Text;
}
set
{
this.EnsureChildControls();
tbPassword.Text = value.ToString();
}
}

[
Browsable(true),
Category( "Behaviour "),
Description( "是否显示注册新用户链接 ")
]
public bool ShowRegister
{
get
{
return _show_register;
}
set
{
_show_register = value;
}
}
protected override void CreateChildControls()
{
base.CreateChildControls ();

//文本

string str = @ " <table align= " "center " " class= " "tableBorder " " cellspacing= " "1 " " cellpadding= " "3 " " width= " "300 " "> ";
str += @ " <tr> <td class= " "column " " align= " "left " " colspan= " "2 " "> " + CAPTION_STRING + " </td> </tr> ";
str += @ " <tr> <td class= " "f " " align= " "center " " valign= " "top " " colspan= " "2 " "> ";
str += @ " <table cellspacing= " "1 " " border= " "0 " " cellpadding= " "2 " "> ";
str += @ " <tr> <td align= " "right " " class= " "txt3 " "> ";
str += USERNAME_STRING;
str += " </td> <td> ";
this.Controls.Add(new LiteralControl(str));

//用户名输入框
tbUserName = new TextBox();
tbUserName.Text = " ";
tbUserName.Width = Unit.Point(80);
tbUserName.MaxLength = 64;
tbUserName.Attributes.Add( "size ", "11 ");
this.Controls.Add(tbUserName);

//验证
vUserName = new LiteralControl( " <font color=red> * </font> ");
vUserName.Visible = false;//先默认控件不可见
this.Controls.Add(vUserName);

//文本
str = @ " </td> </tr> <tr> <td align= " "right " " class= " "txt3 " "> ";
str += PASSWORD_STRING;
str += " </td> <td> ";
this.Controls.Add(new LiteralControl(str));

//密码输入框
tbPassword = new TextBox();
tbPassword.Text = " ";
tbPassword.Width = Unit.Point(80);
tbPassword.MaxLength = 64;
tbPassword.Attributes.Add( "size ", "11 ");
tbPassword.TextMode = TextBoxMode.Password;
this.Controls.Add(tbPassword);

//验证
vPassword = new LiteralControl( " <font color=red> * </font> ");
vPassword.Visible = false;//初时控件不可见
this.Controls.Add(vPassword);

//文本
str = @ " </td> </tr> <tr> <td align= " "right " " colspan= " "2 " "> ";
this.Controls.Add(new LiteralControl(str));

//注册新用户链接
if (ShowRegister)
{
lbRegister = new LinkButton();
lbRegister.Text = REGISTER_STRING;
lbRegister.ToolTip = REGISTER_STRING;
lbRegister.Click +=new EventHandler(lbRegister_Click);
this.Controls.Add(lbRegister);

//文本
str = "   ";
this.Controls.Add(new LiteralControl(str));
}

//登陆按钮
btnLogin = new Button();
btnLogin.Text = LOGIN_STRING;

btnLogin.ToolTip = LOGIN_STRING;
btnLogin.Click +=new EventHandler(btnLogin_Click);
this.Controls.Add(btnLogin);

//文本
str = "   ";
this.Controls.Add(new LiteralControl(str));

//重置按钮
btnReset = new Button();
btnReset.Text = RESET_STRING;
btnReset.ToolTip = RESET_STRING;
btnReset.Click +=new EventHandler(btnReset_Click);
this.Controls.Add(btnReset);

//文本
str = " </td> </tr> </table> </td> </tr> </table> ";
this.Controls.Add(new LiteralControl(str));
}

private void btnLogin_Click(object sender, EventArgs e)//登录
{
bool b = true;
if (UserName.Trim() == " ")
{
vUserName.Visible = true;//控件可见
b = false;//出错标识
}
if (Password.Trim() == " ")
{
vPassword.Visible = true;
b = false;
}
if (b)//用户名和密码都不为空时
{
OnLogin(EventArgs.Empty);
}
}

private void btnReset_Click(object sender, EventArgs e)//重置
{
//vUserName.Visible = true;//控件可见
this.UserName = " ";
this.Password = " ";
OnReset(EventArgs.Empty);
}

private void lbRegister_Click(object sender, EventArgs e)//注册新用户
{
OnRegister(EventArgs.Empty);
}
}


/// <summary>
/// 设计器类
/// </summary>
public class LoginControlDesigner : ControlDesigner
{
public override string GetDesignTimeHtml()
{
return @ " <h3 style= " "COLOR: dodgerblue " "> Login Control </h3> ";
}
}
}


[解决办法]
public class LoginCustomControl : WebControl,INamingContainer
...............

btnLogin = new Button();
btnLogin.ID= "btnLogin ";
...............

btnReset = new Button();
btnReset.ID= "btnReset ";
..............