Chat Application in ASP.NET Using AJAX (Pop-up Windows)

Public Partial Class Login
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Protected Sub btnLogin_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnLogin.Click
        If (((txtUserID.Text.ToUpper() = "USER1") And _
                   (txtPassword.Text = "User1@123")) Or _
                   ((txtUserID.Text.ToUpper() = "USER2") And _
                   (txtPassword.Text = "User2@123")) Or _
                   ((txtUserID.Text.ToUpper() = "USER3") And _
                   (txtPassword.Text = "User3@123"))) Then
            FormsAuthentication.RedirectFromLoginPage _
                 (txtUserID.Text, False)
        End If

    End Sub
End Class