c open a new form then close the current form

Question

For example  Assume that I m in form 1 then I want    Open form 2  from a button in form 1  Close form 1 Focus on form 2

User · Answer

Try to do this           this Hide        Form1 sistema   new Form1        sistema ShowDialog        this Close

User · Answer

The problem beings with that line   Application Run new Form1     Which probably can be found in your program cs file   This line indicates that form1 is to handle the messages loop - in other words form1 is responsible to keep executing your application - the application will be closed when form1 is closed   There are several ways to handle this  but all of them in one way or another will not close form1   Unless we change project type to something other than windows forms application   The one I think is easiest to your situation is to create 3 forms    form1 - will remain invisible and act as a manager  you can assign it to handle a tray icon if you want  form2 - will have the button  which when clicked will close form2 and will open form3 form3 - will have the role of the other form that need to be opened    And here is a sample code to accomplish that   I also added an example to close the app from 3rd form   static class Program            lt summary gt          The main entry point for the application           lt  summary gt       STAThread      static void Main                 Application EnableVisualStyles            Application SetCompatibleTextRenderingDefault false           Application Run new Form1       set the only message pump to form1            public partial class Form1   Form       public static Form1 Form1Instance       public Form1                   Everyone eveywhere in the app should know me as Form1 Form1Instance         Form1Instance   this             Make sure I am kept hidden         WindowState   FormWindowState Minimized          ShowInTaskbar   false          Visible   false           InitializeComponent               Open a managed form - the one the user sees           var form2   new Form2            form2 Show              public partial class Form2   Form       public Form2                 InitializeComponent               private void button1 Click object sender  EventArgs e                var form3   new Form3      create an instance of form 3         Hide                  hide me  form2          form3 Show            show form3         Close                 close me  form2   since form1 is the message loop - no problem           public partial class Form3   Form       public Form3                 InitializeComponent               private void button1 Click object sender  EventArgs e                Form1 Form1Instance Close      the user want to exit the app - let s close form1              Note  working with panels or loading user-controls dynamically is more academic and preferable as industry production standards - but it seems to me you just trying to reason with how things work - for that purpose this example is better   And now that the principles are understood let s try it with just two forms    The first form will take the role of the manager just like in the previous example but will also present the first screen - so it will not be closed just hidden  The second form will take the role of showing the next screen and by clicking a button will close the application           public partial class Form1   Form               public static Form1 Form1Instance           public Form1                           Everyone eveywhere in the app show know me as Form1 Form1Instance             Form1Instance   this              InitializeComponent                       private void button1 Click object sender  EventArgs e                          Make sure I am kept hidden             WindowState   FormWindowState Minimized              ShowInTaskbar   false              Visible   false                 Open another form              var form2   new Form2                                 since we open it from a minimezed window - it will not be focused unless we put it as TopMost                  TopMost   true                            form2 Show                  now that that it is topmost and shown - we want to set its behavior to be normal window again              form2 TopMost   false                        public partial class Form2   Form               public Form2                         InitializeComponent                       private void button1 Click object sender  EventArgs e                        Form1 Form1Instance Close                      If you alter the previous example - delete form3 from the project   Good Luck

User · Answer

I would solve it by doing   private void button1 Click object sender  EventArgs e        Form2 m   new Form2        m Show        Form1 f   new Form1        this Visible   false      this Hide

User · Answer

use this code snippet in your form1   public static void ThreadProc     Application Run new Form        private void button1 Click object sender  EventArgs e    System Threading Thread t   new System Threading Thread new System Threading ThreadStart ThreadProc    t Start    this Close        I got this from here

User · Answer

Suppose you have two Form  First Form Name is Form1 and second form name is Form2 You have to jump from Form1 to Form2 enter code here  Write code like following    On Form1 I have one button named Button1  and on its click option write below code   protected void Button1 Click Object sender EventArgs e        Form frm new Form2      I have created object of Form2     frm Show        this Visible false      this Hide        this Close        this Dispose        Hope this code will help you

User · Answer

Many different ways have already been described by the other answers  However  many of them either involved ShowDialog   or that form1 stay open but hidden  The best and most intuitive way in my opinion is to simply close form1 and then create form2 from an outside location  i e  not from within either of those forms   In the case where form1 was created in Main  form2 can simply be created using Application Run just like form1 before  Here s an example scenario   I need the user to enter their credentials in order for me to authenticate them somehow  Afterwards  if authentication was successful  I want to show the main application to the user  In order to accomplish this  I m using two forms  LogingForm and MainForm  The LoginForm has a flag that determines whether authentication was successful or not  This flag is then used to decide whether to create the MainForm instance or not  Neither of these forms need to know about the other and both forms can be opened and closed gracefully  Here s the code for this   class LoginForm   Form       public bool UserSuccessfullyAuthenticated   get  private set         void LoginButton Click object s  EventArgs e                if AuthenticateUser                                   UserSuccessfullyAuthenticated   true              Close                       static class Program        STAThread      static void Main                 LoginForm loginForm   new LoginForm            Application Run loginForm            if loginForm UserSuccessfullyAuthenticated                           MainForm is defined elsewhere             Application Run new MainForm

User · Answer

this Visible   false                            or                            will make LOgin Form invisivble                           this Enabled   false                               or                           this Hide                                Form1 form1   new Form1                            form1 ShowDialog                             this Dispose

User · Answer

This code may help you   Master frm   new Master     this Hide     frm ShowDialog     this Close

User · Answer

if Form1 is old form and Form2 is the current form which we want to open  then   Form2 f2   new Form1     this Hide      To hide old form i e Form1 f2 Show

User · Answer

I usually do this to switch back and forth between forms   Firstly  in Program file I keep ApplicationContext and add a helper SwitchMainForm method           static class Program       public static ApplicationContext AppContext   get   set          static void Main string   args                Application EnableVisualStyles            Application SetCompatibleTextRenderingDefault false              Save app context         Program AppContext   new ApplicationContext new LoginForm             Application Run AppContext                helper method to switch forms       public static void SwitchMainForm Form newForm                var oldMainForm   AppContext MainForm          AppContext MainForm   newForm          oldMainForm  Close            newForm Show                Then anywhere in the code now I call SwitchMainForm method to switch easily  to the new form      switch to some other form var otherForm   new MyForm    Program SwitchMainForm otherForm

User · Answer

You weren t specific  but it looks like you were trying to do what I do in my Win Forms apps  start with a Login form  then after successful login  close that form and put focus on a Main form  Here s how I do it    make frmMain the startup form  this is what my Program cs looks like     STAThread  static void Main         Application EnableVisualStyles        Application SetCompatibleTextRenderingDefault false       Application Run new frmMain        in my frmLogin  create a public property that gets initialized to false and set to true only if a successful login occurs    public bool IsLoggedIn   get  set     my frmMain looks like this    private void frmMain Load object sender  EventArgs e        frmLogin frm   new frmLogin        frm IsLoggedIn   false      frm ShowDialog         if   frm IsLoggedIn                this Close            Application Exit            return           No successful login  Exit the application  Otherwise  carry on with frmMain  Since it s the startup form  when it closes  the application ends

User · Answer

private void buttonNextForm object sender  EventArgs e        NextForm nf   new NextForm     Object of the form that you want to open     this hide     Hide cirrent form      nf ShowModel     Display the next form window     this Close     While closing the NextForm  control will come again and will close this form as well

User · Answer

Steve s solution does not work  When calling this Close    current form is disposed together with form2  Therefore you need to hide it and set form2 Closed event to call this Close     private void OnButton1Click object sender  EventArgs e        this Hide        var form2   new Form2        form2 Closed     s  args    gt  this Close         form2 Show

User · Answer

I think this is much easier         private void btnLogin Click object sender  EventArgs e                  this Hide              var mm   new MainMenu              mm FormClosed     s  args    gt  this Close              mm Show             this Hide            MainMenu mm   new MainMenu            mm Show

User · Answer

If you have two forms  frm form1 and frm form2  The following code is use to  open frm form2 and close frm form1  For windows form application           this Hide     Hide the  current  form  i e frm form1            show another form   frm form2              frm form2 frm   new frm form2            frm ShowDialog              Close the form  frm form1          this Close

[c#] c# open a new form then close the current form?

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