How to get Forms Count in c# winform

Question

3.33/5 (3 votes)

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Dear Sir/Madam ,

i have little doubt in c# windows application. i Created 3 Forms in my application.

1.Login
2.Reg
3.Display

while run the program i want get active form count .

for ex :
i will open login form . The count will display 1. and i will open second form before close first form the count will display 2.

can u any one help me !

Posted 21-Jan-13 19:38pm

Brinda Arumugam

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Comments

Sergey Alexandrovich Kryukov 22-Jan-13 1:58am

What did you try? Just read MDSN help page on Form...
—SA

5 solutions

Solution 1

C#

private void button1_Click(object sender, EventArgs e)
        {
            int count = Application.OpenForms.Count;
            MessageBox.Show("" + count);
        }

Posted 21-Jan-13 19:44pm

josh-jw

Updated 21-Jan-13 19:45pm

v3

Comments

Sergey Alexandrovich Kryukov 22-Jan-13 1:56am

Will you fix the bug in last line (format string and message box parameter)?
—SA

Kishor Deshpande 22-Jan-13 1:59am

MessageBox.Show(string.Format("No. of open Forms={0}",Application.OpenForms.Count.ToString()));
This will do I guess.

Brinda Arumugam 22-Jan-13 4:35am

THANKS FOR UR CODING :)
I GOT ANSWER BUT THAT COUNT WITH HIDDEN FORMS ALSO. BUT I NEED ONLY ACTIVE FORMS COUNT.
CAN U PLZ TELL ME FOR THIS PROB.

Solution 2

THANKS FOR UR CODING :)
I GOT ANSWER BUT THAT COUNT WITH HIDDEN FORMS ALSO. BUT I NEED ONLY ACTIVE FORMS COUNT.
CAN U PLZ TELL ME FOR THIS PROB.

Posted 21-Jan-13 22:35pm

Brinda Arumugam

Solution 3

Try with code written below:

C#

int count=0;
for(int i=0; i<Application.OpenForms.Count;i++)
{
    if(Application.OpenForms[i].Visible==true)//will not count hidden forms
       count++;
}
MessageBox.Show(string.Format("Active Forms: {0}", count.ToString()));

Posted 22-Jan-13 0:42am

Kishor Deshpande

Updated 22-Jan-13 19:28pm

v4

Comments

Brinda Arumugam 22-Jan-13 23:30pm

thanks for ur coding kishor deshpande :)

in that coding

Application.OpenForms.Item - Not available
[i'm using c#3.5 version]

can u plz help me

Kishor Deshpande 23-Jan-13 1:30am

Hi Brinda, I've modified Application.OpenForms.Item to Application.OpenForms[i], It's working fine for me as I've tested it on my system.

Solution 6

You can determine the number of active (visible) Forms like this:

C#

private int CountActiveForms()
 {
     int cnt = 0;

     foreach (Form theForm in Application.OpenForms) if (theForm.Visible) cnt++;

     return cnt;
 }

Try this simple test:

C#

private void button1_Click(object sender, EventArgs e)
{
    Form f1 = new Form();
    f1.Show();
    Form f2 = new Form();
    f2.Show();
    Form f3 = new Form();
    f3.Show();
    Form f4 = new Form();
    f4.Show();

    Console.WriteLine("Forms: Open: " + Application.OpenForms.Count.ToString() + " Active: " + CountActiveForms().ToString());

    f1.Hide();
    f4.Hide();

    Console.WriteLine("Forms: Open: " + Application.OpenForms.Count.ToString() + " Active: " + CountActiveForms().ToString());
}

Posted 29-Mar-14 11:27am

BillWoodruff

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Kishor Deshpande · Accepted Answer · 2013-01-22T19:34:00

Solution 4

C#

int count = 0;
for (int i = 0; i < Application.OpenForms.Count; i++)
{
    if (Application.OpenForms[i].Visible == true)
        count++;
}
label1.Text = count.ToString(); // Active Forms value :)

Posted 22-Jan-13 19:34pm

Kishor Deshpande

Comments

Kishor Deshpande 23-Jan-13 1:36am

This solution worked, try this :)
Can you please check if it works for you, if it does, can you please upvote my answer?

Brinda Arumugam 23-Jan-13 6:07am

thanks for ur coding ....... its working :)