How to check if form is open, if open close form?

Question

How do I check if a form is open, and if it is open to close the form?

I tried the following, testing out some code but it keep saying the form is not open even when I know it is:

 foreach(Form a in Application.OpenForms) 
 {
     if (a is YouLikeHits_Settings) 
     {
         // About form is open
         MessageBox.Show("form open");
         break;
     }
     // About form is not open...
     MessageBox.Show("form not open");
     break;
 }

Solution 1

Application.OpenForms contains opened forms. If form in this collection, then it is opened. Otherwise it is not opened (possibly closed).

if (Application.OpenForms.OfType<YouLikeHits_Settings>().Any())
    MessageBox.Show("Form is opened");
else
    MessageBox.Show("Form is not opened");

Solution 2

This will work sure

            if (Application.OpenForms.OfType<frm_YouLikeHits_Settings>().Any())
            {
                Application.OpenForms.OfType<frm_YouLikeHits_Settings>().First().Close();
            }
            frm_YouLikeHits_Settings f1= new frm_YouLikeHits_Settings();
            f1.MdiParent = this;
            f1.Show();

Comments

[Edwin Torres]

Was I did was make a button which opens the form, then in another button I put in the code above, when I click it, it keeps saying, form is not open.

[Edwin Torres]

Your code worked to detect it being open :). Any way after it pops up with the message box that the form is open I can close that certain form?

[Sergey Berezovskiy]

Yes, you can: Application.OpenForms.OfType<YouLikeHits_Settings>().First()‌​.Close()

[aminvincent]

i have tried it but my certainly form open cannot be closed automaticly

[aminvincent]

@SergeyBerezovskiy i have same problem like this.. i tried your suggest code and it ran well when i show my form using form1.show(); but when i tried use form1.showdialog(); the form cannot be closed. if any suggest for me i will say thanks so much

[Sergey Berezovskiy]

@aminvincent I think you should create new question with all related to your problem information and code to reproduce issue.

[aminvincent]

@SergeyBerezovskiy thanks for your suggest,..finally i create new question and this the link that i created and that it solved: stackoverflow.com/questions/35471376/…

[Juano]

Many thanks, it worked like a charm and exactly what you said and I needed :)