To Open a window form using condition

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1)with timer i am loading a form showing users online
2)while the timer loading the users online it will checks any messages from the users if so it will open a new window form.

Issue:
if a form is opened already for an user(A) again its opening a new form for the same user(A).
My Code:

C#

private void timer1_Tick(object sender, EventArgs e)
        {
            displaying users online
             {
               any messages from the user
               if the above statement is true 
               {
                 //open a new chat form
               }
             }
        }

How to resolve the issue to stop opening multiple forms for single user.

Posted 4-Jun-13 2:36am

riodejenris14

Updated 4-Jun-13 3:10am

Aarti Meswania

v2

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2 solutions

Solution 1

It's not very clear what you mean exactly. But simply have a reference to the form and check it isn't null or if(form.Visible). You can also cancel the timer when opening a form outside of the timer.

Good luck!

Posted 4-Jun-13 2:56am

E.F. Nijboer

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Aarti Meswania · Accepted Answer · 2013-06-04T03:26:00

you have a main form inside which multiple chat forms are loading...
now,in that mainform,
take page level variable

C#

List<int> openedchats = new List<int>();  </int></int>

now, when open form on timer

C#

if (!openedchats.Contains(userId))
{ 
    openedchats.add(userId);

    frmchat c = new frmchat();
    c.Tag = userId;
    c.Parent = this;
    c.show();
}
else
{
    //nothing to do
}

Add method... in parent form

C#

public void RemovefromOpenedchats(int userid)
{
     openedchats.Remove(userId);	
}

and in frmchat form
in form_closing event

C#

(MainForm)this.Parent.RemovefromOpenedchats((int)this.Tag);

Happy Coding!
:)