default.aspx.cs

这是一个C#做的AJAX聊天室

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace Uchat.Pages
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        private bool ValidateNick(string nicks)
        {
            if (nicks == string.Empty) 
            {
                lblErrorMsg.Text = "please input your nick name here";
            }
            foreach (char c in nicks)
            {
                if ((int)c < 65 || (int)c > 122)
                {
                    lblErrorMsg.Text = string.Format("Nickname can only contain letters.  {0} is an invalid character", c);
                    return false;
                }
            }
            if (nicks.Length > 10)
            {
                lblErrorMsg.Text = "Nickname too long, please enter a nickname that is less than 10 characters";
                return false;
            }
            return true;
        }
        protected void btnLogin_Click(object sender, EventArgs e)
        {
            string user = txtUsername.Text.Trim();
            if (!ValidateNick(user)) { return; }
            if (UChat.Global.Engine.UserExists(user)) { lblErrorMsg.Text = "A user with this name already exists, try another name again"; return; }
            Response.Redirect("Server.aspx?action=Login&u=" + user);
        }
}
}