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"]="
";
			}
			else{
				Application.Lock(); 
				Application["user"] = Session["username"]+"进入聊天室
"+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+"]"+"
";
		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>