[C# Windows Forms] Open form in static main

Thang Le

7y1.9kWindows Forms

Hi everybody.
I have 2 form : MainFrm is main form and Notification is form used to show notification.
In program.cs :

static void Main()
{
bool result;
Mutex mutex = new Mutex(true, "UniqueAppId", out result);
if (!result)
{
//MainFrm.showNotification("KyAppAPI??????????");
//MessageBox.Show("KyAppAPI??????????");
Notification notiBox = new Notification();
notiBox.Show();
return;
}

Application.EnableVisualStyles();

Application.SetCompatibleTextRenderingDefault(false);

Application.Run(new MainFrm());

GC.KeepAlive(mutex);

}

[/CODE]

I use mutex to keep application run once. If application already running, form Notification will show.
But my code work not right, form Notification not shown.
In MainFrm, I has a static method showNotification (using Tulpep Notification). I try calling this method in static main, but it not working, too.
However, if I use MessageBox, it working fine.
I don't know where the problem is. Please help me.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Salman Beg7y ago
Hi.
First put try catch block in your code and follow this article to do the same,
https://www.c-sharpcorner.com/UploadFile/puranindia/try-catch-finally-in-C-Sharp/

https://www.tutorialsteacher.com/csharp/csharp-exception-handling

https://www.tutorialspoint.com/csharp/csharp_exception_handling.htm

After that run the program and debug the code and for that you can follow this article,
https://docs.microsoft.com/en-us/visualstudio/debugger/debugger-feature-tour?view=vs-2017

https://www.dotnetperls.com/debugging
Thanks.
Thang Le7y ago
@Salman : Thanks for your reply.
I 'm a newbie C# so I don't know how debug in Visual Studio.
Here is code file Notification.cs :
public partial class Notification : Form
    {
        private System.Windows.Forms.Timer timer1;
        private System.Windows.Forms.Timer timer2;
        public Notification()
        {
            InitializeComponent();

            timer1 = new System.Windows.Forms.Timer();
            timer1.Interval = 10;
            timer1.Tick += new EventHandler(timer1_Tick);
            timer1.Start();

            timer2 = new System.Windows.Forms.Timer();
            timer2.Interval = 10;
            timer2.Tick += new EventHandler(timer2_Tick);
        }

        public void timer1_Tick(object sender, EventArgs e)
        {
            Rectangle workingArea = Screen.GetWorkingArea(this);
            if (Location.Y > workingArea.Bottom - Size.Height)
            {
                this.Location = new Point(Location.X, Location.Y - 1);
            }
            else
            {
                timer1.Stop();
                Thread.Sleep(3000);
                timer2.Start();
            }
        }

        public void timer2_Tick(object sender, EventArgs e)
        {
            Rectangle workingArea = Screen.GetWorkingArea(this);
            if (Location.Y < workingArea.Bottom)
            {
                this.Location = new Point(Location.X, Location.Y + 1);
            }
            else
            {
                timer2.Stop();
            }
        }

        public void show()
        {
            Rectangle workingArea = Screen.GetWorkingArea(this);
            this.Location = new Point(workingArea.Right - Size.Width,
                                      workingArea.Bottom);
            this.Show();
        }
    }
Salman Beg7y ago
Hi. By looking at your code I didn't find any kind of error. Could you please put the whole code in try catch block, put debugger and check whether you are getting any error or not. Thanks