What is the way to close the form and open the same form again

Question

1.00/5 (2 votes)

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i try to close the from and open it again with this code bout it didn't close the form i found it in the background and open another one for it

C#

private void Graph_Load(object sender, EventArgs e)
    {
       System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer();

        timer1.Interval = 60000;//1 minutes
        timer1.Tick += new System.EventHandler(Timer1_Tick);
        timer1.Start();
    } 

 private void Timer1_Tick(object sender, EventArgs e)
    {
        //do whatever you want 
        RefreshMyForm();
    }


    private void RefreshMyForm()
    {
        this.Close();

        Graph1 graph = new Graph1();
        graph.Show();


    }

What I have tried:

C#

private void RefreshMyForm()
        {
            this.Hide();
            var Graph1 = new Graph1();
            Graph1.Closed += (s, args) => this.Close();
            Graph1.Show();

        }

and

C#

private void RefreshMyForm()
        {
            this.Hide();
            Graph1 sistema = new Graph1();
            sistema.ShowDialog();
            this.Close();

        }

Posted 13-Feb-19 19:59pm

el_tot93

Updated 14-Feb-19 4:16am

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Comments

Richard Deeming 14-Feb-19 10:22am

REPOST
This is the same question you posted yesterday:
https://www.codeproject.com/Questions/1277212/How-do-I-refresh-form-with-timer[^]

2 solutions

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RickZeeland · Answer 1 · 2019-02-13T20:16:00

Solution 1

You need to use InvokeRequired when calling the UI from another thread, see examples here:
c# - Automating the InvokeRequired code pattern - Stack Overflow[^]
Thread-Safe Calls Using Windows Form Controls in C#[^]
How to: Make Thread-Safe Calls to Windows Forms Controls | Microsoft Docs[^]

Posted 13-Feb-19 20:16pm

RickZeeland

Updated 13-Feb-19 20:22pm

v2

Comments

el_tot93 14-Feb-19 2:26am

thx bro but i don't understand anything

RickZeeland 14-Feb-19 3:54am

Your timer starts a separate Thread which calls Timer1_Tick(), here you need to check InvokeRequired before doing things on the main UI (User Interface) thread.
Sorry about that, but this ugly construction is something unavoidable and you will have to learn it to become a good C# programmer.

Dylvh · Answer 2 · 2019-02-14T04:16:00

The reason it's opening another form is because you're initializing a new instance of the form by having

Graph1 Sistema = new Graphh1();

Try the following

private void RefreshMyForm()
        {
            if (this.Visible)
            {
               this.Hide();
            }
            else
            {
               this.Show();
            }

        }

By not initializing a new instance you're working with the one you already have. It doesn't actually closes the form but rather makes it invisible after a minute and after another minute makes it visible again.

I think to close and open the form with the timer you have on the form would be a bit difficult. You'll have to work through the links that Rick posted.