login.aspx.cs

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using System;
using System.Data;
using System.Configuration;
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;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        string[] user = (string[])Application["user"];
        int length = 0;
        int i = 0;
        while (user[i] != null)
        {
            length++;
            i++;
        }
        user[length] = this.txtUserName.Text;
        Application.Lock();
        Application.Add("user", user);
        Application.UnLock();
        Session.Add("userName", this.txtUserName.Text);
        Response.Redirect("chat.aspx");
        
        
       
        
    }
}