How do I prevent the app from terminating when I close the startup form?

Question

There is two Forms in my project : Form1 and Form2. There is a button in Form1, and what I want to do is closing Form1 and showing Form2 when that button clicked.

Fi

Answer 1

Write that into your method which is executed while FormClosing event occure.

private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
      // Display a MsgBox asking the user if he is sure to close
      if(MessageBox.Show("Are you sure you want to close?", "My Application", MessageBoxButtons.YesNo) 
         == DialogResult.Yes)
      {
         // Cancel the Closing event from closing the form.
         e.Cancel = false;
         // e.Cancel = true would close the window
      }
}