How to open a new form from another form

Question

I have form which is opened using ShowDialog Method  In this form i have a Button called More  If we click on More it should open another form and it should close the current form   on More Button s Click event Handler i have written the following code  MoreActions objUI   new MoreActions      objUI ShowDialog    this Close      But what is happening is  it s not closing the first form  So  i modified this code to   MoreActions objUI   new MoreActions      objUI Show    this Close      Here  The second form is getting displayed and within seconds both the forms getting closed   Can anybody please help me to fix issue   What i need to do is  If we click on More Button  it should open another form and close the first form   Any kind of help will be really helpful to me

User · Answer

You could try adding a bool so the algorithm would know when the button was activated. When it's clicked, the bool checks true, the new form shows and the last gets closed.

It's important to know that forms consume some ram (at least a little bit), so it's a good idea to close those you're not gonna use, instead of just hiding it. Makes the difference in big projects.

User · Answer

you may consider this example    Form1 Window   EventHandler Form1 frm2   new Form1          frm2 Show this     this will show Form2     frm1 Hide       this Form will hide

User · Answer

I would use a value that gets set when more button get pushed closed the first dialog and then have the original form test the value and then display the the there dialog   For the Ex      Create three windows froms   Form1 Form2 Form3   Add One button to Form1   Add Two buttons to form2    Form 1 Code    public partial class Form1   Form       public Form1                 InitializeComponent               private bool DrawText   false       private void button1 Click object sender  EventArgs e                Form2 f2   new Form2            f2 ShowDialog            if  f2 ShowMoreActions                        Form3 f3   new Form3                f3 ShowDialog                        Form2 code    public partial class Form2   Form            public Form2                         InitializeComponent                       public bool ShowMoreActions   false          private void button1 Click object sender  EventArgs e                        ShowMoreActions   true              this Close                        private void button2 Click object sender  EventArgs e                        this Close                       Leave form3 as is

User · Answer

ok so I used this   public partial class Form1   Form       private void Button Click object sender  EventArgs e                Form2 myForm   new Form2            this Hide            myForm ShowDialog            this Close              This seems to be working fine but the first form is just hidden and it can still generate events  the  this Close    is needed to close the first form but if you still want your form to run  and not act like a launcher  you MUST replace it with   this Show      Best of luck

User · Answer

In my opinion the main form should be responsible for opening both child form  Here is some pseudo that explains what I would do      MainForm private ChildForm childForm  private MoreForm moreForm   ButtonThatOpenTheFirstChildForm Click         childForm   CreateTheChildForm        childForm MoreClick    More Click      childForm Show       More Click         childForm Close        moreForm   new MoreForm        moreForm Show        You will just need to create a simple event MoreClick in the first child  The main benefit of this approach is that you can replicate it as needed and you can very easily model some sort of basic workflow

User · Answer

Try this      button1 will be clicked to open a new form private void button1 Click object sender  EventArgs e        this Visible   false         this   is the current form     SignUp s   new SignUp       SignUp is the name of  my other form     s Visible   true

User · Answer

private void Button1 Click object sender  EventArgs e        NewForm newForm   new NewForm         Create the New Form Object     this Hide         Hide the Old Form     newForm ShowDialog         Show the New Form     this Close         Close the Old Form

User · Answer

If I got you right  are you trying like this       into this    in your Form1  add this event in your button          button event in your Form1     private void button1 Click object sender  EventArgs e                Form2 f2   new Form2            f2 ShowDialog       Shows Form2         then  in your Form2 add also this event in your button          button event in your Form2     private void button1 Click object sender  EventArgs e                Form3 f3   new Form3       Instantiate a Form3 object          f3 Show       Show Form3 and         this Close       closes the Form2 instance

User · Answer

Use this Hide   instead of this Close

User · Answer

For example  you have a Button named as Button1  First click on it it will open the EventHandler of that Button2 to call another Form you should write the following code to your Button   your name example form2   form2 obj new form2     obj show      To close form1  write the following code   form1 visible false   or form1 Hide

User · Answer

You need to control the opening of sub forms from a main form     In my case I m opening a Login window first before I launch my form1   I control everything from Program cs   Set up a validation flag in Program cs   Open Login window from Program cs   Control then goes to login window   Then if the validation is good  set the validation flag to true from the login window   Now you can safely close the login window   Control returns to Program cs   If the validation flag is true  open form1   If the validation flag is false  your application will close   In Program cs      static class Program                    lt summary gt              The main entry point for the application               lt  summary gt                          Validation flag         public static bool ValidLogin   false            STAThread          static void Main                         Application EnableVisualStyles                Application SetCompatibleTextRenderingDefault false                 Application Run new Login                  if  ValidLogin                                Application Run new Form1                                      In Login cs          private void btnOK Click object sender  EventArgs e                        if  txtUsername Text     x   amp  amp  txtPassword Text     x                                 Program ValidLogin   true                  this Close                              else                               MessageBox Show  Username or Password are incorrect                                      private void btnExit Click object sender  EventArgs e                        Application Exit

[c#] How to open a new form from another form

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