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

Question

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  amp  amp  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      amp  amp  passwordTxt Text Equals                      MessageBox Show  Invalid Username or Password                 else                               if  this userNameTxt Text    username2  amp  amp  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

User · Answer

You need to add the following line   using FootballLeagueSystem    into your all your classes  MainMenu cs  programme cs  etc   that use Login   At the moment the compiler can t find the Login class

User · Answer

You don t have the namespace the Login class is in as a reference   Add the following to the form that uses the Login class   using FootballLeagueSystem    When you want to use a class in another namespace  you have to tell the compiler where to find it  In this case  Login is inside the FootballLeagueSystem namespace  or   FootballLeagueSystem Login is the fully qualified namespace   As a commenter pointed out  you declare the Login class inside the FootballLeagueSystem namespace  but you re using it in the FootballLeague namespace

User · Answer

This error comes because compile does not know where to find the class  so it occurs mainly when u copy or import item   to solve this    1 change the namespace in the formname cs and formname designer cs to the name of your project

User · Answer

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

User · Answer

If you have Login in a seperate folder within your project make sure that where you are using it you do    using FootballLeagueSystem  Whatever folder you are using

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

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