Question

I’m trying to implement a session login into my web application. At the moment I’m receiving an error message “The name ‘txtUserName’ does not exist in the current context. When I check the aspx file the textbox ID=”txtUserName” exists.

<h2>
    Log In
</h2>
<p>
    Please enter your username and password.
    <asp:HyperLink ID="RegisterHyperLink" runat="server" EnableViewState="false">Register</asp:HyperLink> if you don't have an account.
</p>
<asp:Login ID="LoginUser" runat="server" EnableViewState="false" RenderOuterTable="false">
    <LayoutTemplate>
        <span class="failureNotification">
            <asp:Literal ID="FailureText" runat="server"></asp:Literal>
        </span>
        <asp:ValidationSummary ID="LoginUserValidationSummary" runat="server" CssClass="failureNotification" 
             ValidationGroup="LoginUserValidationGroup"/>
        <div class="accountInfo">
            <fieldset class="login">
                <legend>Account Information</legend>
                <p>
                    <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">Username:</asp:Label>
                    <asp:TextBox ID="txtUserName" runat="server" CssClass="textEntry"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName" 
                         CssClass="failureNotification" ErrorMessage="User Name is required." ToolTip="User Name is required." 
                         ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                </p>
                <p>
                    <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                    <asp:TextBox ID="txtPassword" runat="server" CssClass="passwordEntry" TextMode="Password"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password" 
                         CssClass="failureNotification" ErrorMessage="Password is required." ToolTip="Password is required." 
                         ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                </p>
                <p>
                    <asp:CheckBox ID="RememberMe" runat="server"/>
                    <asp:Label ID="RememberMeLabel" runat="server" AssociatedControlID="RememberMe" CssClass="inline">Keep me logged in</asp:Label>
                </p>
            </fieldset>
            <p class="submitButton">
                <asp:Button ID="LoginButton" Onclick="LoginButton_Click" runat="server" CommandName="Login" Text="Log In" ValidationGroup="LoginUserValidationGroup"/>
            </p>
        </div>
    </LayoutTemplate>
</asp:Login>

My current code behind file is:

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;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections.Generic;

namespace Project.Account
{
    public partial class Login : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            RegisterHyperLink.NavigateUrl = "Register.aspx?ReturnUrl=" + HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);
        }

        protected void LoginButton_Click(object sender, EventArgs e)
        {

            string connectionString = WebConfigurationManager.ConnectionStrings["DBConnectionString1"].ConnectionString;


            SqlConnection con = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand("LoginUsers", con);
            cmd.CommandType = CommandType.StoredProcedure;


            cmd.Parameters.Add(new SqlParameter("@UserName", SqlDbType.VarChar, 20));
            cmd.Parameters["@UserName"].Value = txtUserName.Text;

            cmd.Parameters.Add(new SqlParameter("@Password", SqlDbType.VarChar, 20));
            cmd.Parameters["@Password"].Value = txtPassword.Text;


                        }
    }
}

txtUSerName.Text and txtPassword.Text are the one that have the underlined error

Answer 1

First mistake

from your markup :

<asp:TextBox ID="txtUserName"
<asp:TextBox ID="txtPassword"

But in the code behind, you are using:

if (UserName.Text == [@"Username"] && Password.Text == [@"Password"])

Secondly, controls that are in the login control are not directly accessible in the code behind. You have to find the control and get the text from them. It should be like…

cmd.Parameters["@USerName"].Value = 
                    ((TextBox)LoginUser.FindControl("txtUserName")).Text;

 cmd.Parameters["@Password"].Value = 
                    ((TextBox)LoginUser.FindControl("txtPassword")).Text;