asp.net做一个简易的聊天室

要求：

结果：

关键代码：
Default.aspx

<form id="form1" runat="server">
<div>
<asp:Label ID="username_label" runat="server" Text="用户名：" Width="80px"></asp:Label>
<asp:TextBox ID="username_text" runat="server" ></asp:TextBox>
<br />
<asp:Label ID="password_label" runat="server" Text="房间密码：" Width="80px"></asp:Label>
<asp:TextBox ID="password_text" runat="server"></asp:TextBox>
<br />
<asp:Button ID="login" runat="server" Text="登录" OnClick="login_Clicked"/>
</div>
</form>

Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
//Application.Clear();
Session["username"] = username_text.Text;
}
protected void login_Clicked(object sender, EventArgs e){
if(password_text.Text.Equals("2020")){//设置聊天室密码为2020
if(Application["user"]==null){
Application["user"]="<hr/>";
}
else{
Application.Lock();
Application["user"] = Session["username"]+"进入聊天室</br>"+Application["user"];
Application.UnLock();
Response.Redirect("Default4.aspx");//聊天室
}
}
}

Default2.aspx

<script type="text/javascript">
setTimeout("location.href='Default2.aspx'",1000);//刷新时间一秒一次
</script>

Default2.aspx.cs

protected void Page_Load(object sender, EventArgs e){
Response.Write(Application["user"].ToString());//输出用户进入聊天室
if(Application["chat"]==null){//聊天记录，若没有人聊天为空，否则就打印出来聊天内容
Application["chat"]="";
}
else{
Response.Write(Application["chat"].ToString());
}
}

Default3.aspx

<form id="form1" runat="server">
<div >
<%Response.Write("发言人："+Session["username"]); %>
<br />
<asp:TextBox ID="chatbox" runat="server"></asp:TextBox>
<asp:Button ID="text_send" runat="server" Text="发送" OnClick="text_send_Clicked" />
</div>
</form>

Default3.aspx.cs

protected void text_send_Clicked(object sender, EventArgs e){
Application.Lock();
Application["chat"] = Application["chat"].ToString()+ Session["username"]+":"+chatbox.Text+"["+DateTime.Now+"]"+"</br>";
Application.UnLock();
Response.Redirect("Default3.aspx");//此处重定向是为了删除文本框中的内容
}

Default4.aspx

<form id="form1" runat="server">
<div>
<iframe id="iframe1" src="Default2.aspx" frameborder="0" width="100%" height="300px"></iframe>
</br>
<iframe id="iframe2" src="Default3.aspx" frameborder="0" width="100%" height="300px"></iframe>
</div>
</form>