Question

I’m trying to detect whether or not the user have save their work before closing the program. I’ve tried the below coding:

void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (e.CloseReason == CloseReason.UserClosing)
        MessageBox.Show("Unsave Work");
}

But it does not work. Nothing happen when I close the program.

Answer 1

There are two primary ways to add an EventHandler in .Net.

You can use the designer to add it.

Or you can add it in code

public Form1()
{
    InitializeComponent();
    this.FormClosing+=new FormClosingEventHandler(Form1_FormClosing);
}

void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (e.CloseReason == CloseReason.UserClosing)
    {
        var result = MessageBox.Show("Unsave Work", "", MessageBoxButtons.OKCancel);
        if (result == DialogResult.Cancel)
            e.Cancel = true;      
    }
}