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Back button affected by FormClosing event

I want to go back to the form1 but everytime I click the back button, it triggers the FormClosing event so it prompts me if I want to quit the application. How can I solve this problem in order to exclude the other buttons from the FormClosing event?
private void Form2_FormClosing_1(object sender, FormClosingEventArgs e)
{
DialogResult dialog = MessageBox.Show("Do you really want to quit?", "Exit",
MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes)
{
Application.Exit();
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}
}
private void back_button_Click(object sender, EventArgs e)
{
this.Hide();
}

Best thing to do would be to set global variable that will tell closing event to show/not show that dialog.
Try something along these lines.
private bool CalledFromButton = false;
private void Form2_FormClosing_1(object sender, FormClosingEventArgs e)
{
if(CalledFromButton)
return;
DialogResult dialog = MessageBox.Show("Do you really want to quit?", "Exit",
MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes)
{
Application.Exit();
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}
}
private void back_button_Click(object sender, EventArgs e)
{
CalledFromButton = true;
this.Hide();
}

Click "yes" double when closing form C#?

I write a code for event close form C#. It works, but when I click "yes" to close form I must click twice.
What wrong with it? And how can I fix this problem?
Here is my code
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult result = MessageBox.Show("Sure?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (result == DialogResult.No)
{
Application.Exit();
}
else
{
e.Cancel = true;
}
}

Your logic right now will run e.Cancel = true if you click yes, as in it cancels the closing.
Also, as mentioned in the comments, Application.Exit() is not necessary.

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult result = MessageBox.Show("Sure?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (result != DialogResult.Yes)
e.Cancel = true;
}

A simpler version would be something like this:
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = (MessageBox.Show("Sure?",
"Exit",
MessageBoxButtons.YesNo,
MessageBoxIcon.Question) == DialogResult.Yes);
}
If the use clicks the Yes button, then e.Cancel will be set to true.
If e.Cancel is set to true, the form will not close.
otherwise let the form closing sequence run it's course.

Calling the Application.Exit will trigger the FormClosing event again. The solution is easier than you think:
if (result == DialogResult.No)
{
e.Cancel = false; //It works as you expected
}
else
{
e.Cancel = true;
}

How to make Exit confirmation yes or no on Control Button using C# Window Form

I have a one issue in my window application, there are two form :login and main.
I have created Exit Button on both form and also coded of Exit Confirmation.
It works fine when we Press Exit Button message No on form 1. But We login to on form to
another form and second form Exit Button message button press No , and then back to return
form one and then click exit btton No ::::::it will display two times message PopUp of confirmation...............
Code
private void Btn_Exit_Click(object sender, EventArgs e)
{
DialogResult dr = MessageBox.Show("Do you want to exit.", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dr == DialogResult.Yes)
{
Application.ExitThread();
} else
{ }
}
Plz there is any solution in c#............

Just code this.
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("Do you want to close this application?", "Exit", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.No)
{
e.Cancel = true;
}
}

In your case consider LoginForm and MainForm , Once you logged in you try to hide the LoginForm and show MainForm. Problem is when you try to close MainForm it will invoke the respective FormCloseEvent and once you chose to close, it automatically invoke parent form that is hiding in background, so it invokes LoginForm's FormCloseEvent. This is the reason for two time Popups.
To resolve this you need to trigger an event i.e whenever Child form is closed you need to raise a flag, so in your parent's FormCloseEvent you need to check for flag, if flag is true you no need to show the pop up.
private bool isMainFormClosed = false;
private void showMainForm()
{
// Hide the loginform UI.
this.Hide();
var mainForm = new MainForm();
// Creating close event for mainform, whenever close icon is clicked it will close the login form which is hiding in background.
mainForm.FormClosed += new FormClosedEventHandler(mainFormClosed);
// Show the mainform UI
mainForm.Show();
}
private void mainFormClosed(object sender, FormClosedEventArgs e)
{
this.isMainFormClosed = true;
this.Close();
}
private void loginFormClosing(object sender, FormClosingEventArgs e)
{
if(!this.isMainFormClosed)
{
DialogResult dialogResult = MessageBox.Show("Do you want to close the application",AppConstants.APPLICATION_NAME,
MessageBoxButtons.YesNo,MessageBoxIcon.Question);
if(dialogResult == DialogResult.No)
e.Cancel = true;
}
}

DialogResult is returned by dialogs after dismissal. It indicates which button was clicked on the dialog by the user.
Code
private void btnExit_Click(object sender, EventArgs e)
{
const string message = "Do you want to exit?";
const string caption = "EXIT";
var result = MessageBox.Show(message, caption, MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (result == DialogResult.Yes)
{
Application.Exit();
}
else if (result == DialogResult.Yes)
{
this.Close();
}
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (MessageBox.Show("Do you want to close this application?", "Exit", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.No)
{
e.Cancel = true;
}
}

Double confirmation program exiting

somehow i dont know my program needs a second confirmation to exit...how can i remove it?
private void MainProg_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult dialog = MessageBox.Show("Θέλετε πραγματικά να κλείσει η εφαρμογή?",
"Κλείσιμο", MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes )
{
Application.Exit();
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}
}

Your call to Application.Exit causes a second call to MainProg_FormClosing. Exiting the application is handled automatically; the call to Application.Exit is unnecessary.
You can simply remove the call to Application.Exit to prevent the second confirmation dialog:
DialogResult dialog = MessageBox.Show("Θέλετε πραγματικά να κλείσει η εφαρμογή?",
"Κλείσιμο", MessageBoxButtons.YesNo);
if (dialog == DialogResult.No)
{
e.Cancel = true;
}
Edited to add:
If you need to call Application.Exit (e.g., multiple message pumps), you can suppress the dialog if the form is being closed due to an Application.Exit call:
private void MainProg_FormClosing(object sender, FormClosingEventArgs e)
{
// Add this line:
if (e.CloseReason == CloseReason.ApplicationExitCall) return;
// remainder of code as in original:
DialogResult dialog = MessageBox.Show("Θέλετε πραγματικά να κλείσει η εφαρμογή?",
"Κλείσιμο", MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes )
{
Application.Exit();
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}
}

The problem is you're callng FormClosing when using Application.Exit because Application.Exit also callFormClosing so you need to do this
DialogResult dialog = MessageBox.Show("Θέλετε πραγματικά να κλείσει η εφαρμογή?",
"Κλείσιμο", MessageBoxButtons.YesNo);
if (dialog == DialogResult.Yes)
{
e.Cancel = false;
}
else if (dialog == DialogResult.No)
{
e.Cancel = true;
}

How to prevent or block closing a WinForms window?

How can I prevent window closing by showing a MessageBox? (Technology:WinForms with C#)
When the close event occurs I want the following code to be run:
private void addFile_FormClosing( object sender, FormClosingEventArgs e ) {
var closeMsg = MessageBox.Show( "Do you really want to close?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question );
if (closeMsg == DialogResult.Yes) {
//close addFile form
} else {
//ignore closing event
}
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
var window = MessageBox.Show(
"Close the window?",
"Are you sure?",
MessageBoxButtons.YesNo);
e.Cancel = (window == DialogResult.No);
}

Catch FormClosing event and set e.Cancel = true
private void AdminFrame_FormClosing(object sender, FormClosingEventArgs e)
{
var res = MessageBox.Show(this, "You really want to quit?", "Exit",
MessageBoxButtons.YesNo, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2);
if (res != DialogResult.Yes)
{
e.Cancel = true;
return;
}
}

A special twist might be to always prevent just the user closing the form:
private void Frm_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = (e.CloseReason == CloseReason.UserClosing);
// disable user closing the form, but no one else
}

Within your OnFormClosing event you can show the dialog and if answer is false (to not show) then set the Cancel property of the EventArgs to true.

For prevent or block the form closing in particular situation you can use this strategy:
private void MyForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (FLAG_CONDITION == true)
{
MessageBox.Show("To exit save the change!!");
e.Cancel = true;
}
}

Straight from MSDN:
private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
// Determine if text has changed in the textbox by comparing to original text.
if (textBox1.Text != strMyOriginalText)
{
// Display a MsgBox asking the user to save changes or abort.
if(MessageBox.Show("Do you want to save changes to your text?", "My Application",
MessageBoxButtons.YesNo) == DialogResult.Yes)
{
// Cancel the Closing event from closing the form.
e.Cancel = true;
// Call method to save file...
}
}
}
In your case you don't need to do anything to explicitly close the form. Unless you cancel it it will close automatically, so your code would be:
private void addFile_FormClosing( object sender, FormClosingEventArgs e ) {
var closeMsg = MessageBox.Show( "Do you really want to close?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question );
if (closeMsg == DialogResult.Yes) {
// do nothing
} else {
e.Cancel = true;
}
}

You can run any code you want when closing the form then, hide the form instead of closing it to prevent it from being disposed
yourFormName.FormClosing += (s, e) =>
{
// any code you want
yourFormName.Hide(); // this hides the form
e.Cancel = true; // this cancels the close event, you can put any boolean exprission
};