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The type or namespace cannot be found (are you missing a using directive or an assembly reference?)

I get the following error when I try to compile my C# program:

The type or namespace name 'Login' could not be found (are you missing a using directive or an assembly reference?)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace FootballLeague
{
    public partial class MainMenu : Form
    {
    FootballLeagueDatabase footballLeagueDatabase;
    Game game;
    Team team;
    Login login; //Error here

    public MainMenu()
    {
        InitializeComponent();
        changePanel(1);
    }

    public MainMenu(FootballLeagueDatabase footballLeagueDatabaseIn)
    {
        InitializeComponent();
        footballLeagueDatabase = footballLeagueDatabaseIn;
    }

    private void Form_Loaded(object sender, EventArgs e)
    {
    }

    private void gameButton_Click(object sender, EventArgs e)
    {
        int option = 0;
        changePanel(option);
    }
    private void scoreboardButton_Click(object sender, EventArgs e)
    {
        int option = 1;
        changePanel(option);
    }
    private void changePanel(int optionIn)
    {
        gamePanel.Hide();
        scoreboardPanel.Hide();

        string title = "Football League System";

        switch (optionIn)
        {
            case 0:
                gamePanel.Show();
                this.Text = title + " - Game Menu";
                break;
            case 1:
                scoreboardPanel.Show();
                this.Text = title + " - Display Menu";
                break;
        }
    }

    private void logoutButton_Click(object sender, EventArgs e)
    {
        login = new Login();
        login.Show();
        this.Hide();
    }

Login.cs class:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace FootballLeagueSystem
{
    public partial class Login : Form
    {
    MainMenu menu;
    public Login()
    {
        InitializeComponent();
    }

    private void administratorLoginButton_Click(object sender, EventArgs e)
    {
        string username1 = "08247739";
        string password1 = "08247739";

        if ((userNameTxt.Text.Length) == 0)
            MessageBox.Show("Please enter your username!");
        else if ((passwordTxt.Text.Length) == 0)
            MessageBox.Show("Please enter your password!");
        else if (userNameTxt.Text.Equals("") || passwordTxt.Text.Equals(""))
            MessageBox.Show("Invalid Username or Password!");
        else
        {
            if (this.userNameTxt.Text == username1 && this.passwordTxt.Text == password1)
                MessageBox.Show("Welcome Administrator!", "Administrator Login");
            menu = new MainMenu();
            menu.Show();
            this.Hide();
        }
    }

    private void managerLoginButton_Click(object sender, EventArgs e)
    {
        {
            string username2 = "1111";
            string password2 = "1111";

            if ((userNameTxt.Text.Length) == 0)
                MessageBox.Show("Please enter your username!");
            else if ((passwordTxt.Text.Length) == 0)
                MessageBox.Show("Please enter your password!");
            else if (userNameTxt.Text.Equals("") && passwordTxt.Text.Equals(""))
                MessageBox.Show("Invalid Username or Password!");
            else
            {
                if (this.userNameTxt.Text == username2 && this.passwordTxt.Text == password2)
                    MessageBox.Show("Welcome Manager!", "Manager Login");
                menu = new MainMenu();
                menu.Show();
                this.Hide();
            }
        }
    }

    private void cancelButton_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    }
}

Where is the error? What am I doing wrong?

like image 680
Leo Avatar asked Apr 27 '10 13:04

Leo


People also ask

How do you resolve the type or namespace could not be found?

A type or namespace that is used in the program was not found. You might have forgotten to reference (References) the assembly that contains the type, or you might not have added the required using directive. Or, there might be an issue with the assembly you are trying to reference.

Why am I getting error CS0246 the type or namespace name could not be found?

error CS0246: The type or namespace name `________' Could not be found. Are you missing a using directive of assembly reference? This error is caused when the namespace that you are trying to use does not exist.


1 Answers

I get this error when my project .net framework version does not match the framework version of the DLL I am linking to. In my case, I was getting:

"The type or namespace name 'UserVoice' could not be found (are you missing a using directive or an assembly reference?).

UserVoice was .Net 4.0, and my project properties were set to ".Net 4.0 Client Profile". Changing to .Net 4.0 on the project cleared the error. I hope this helps someone.

like image 131
Parrhesia Joe Avatar answered Oct 04 '22 19:10

Parrhesia Joe