Develop Reference

opening folder browser dialog on button click c#

im trying to trigger a folder browser dialog with a button in c#
ive tried
private void Button2_Click(object sender, EventArgs e)
{
DialogResult auswahl2 = folderBrowserDialog2.ShowDialog();
if (auswahl2 == DialogResult.OK)
{
TextBox5.Text = folderBrowserDialog2.SelectedPath;
}
}
but neither debug nor release will open one on button click.
What am i missing ?
Thanks in Advance

Go to your form, and double-click the button in question, see if it pointed to the above function, or a new event function is created.
If it was the second, copy everything above to the new function and run the program again, everything should be fine after that.
If you want to do it manually, go to YourForm.Designer.cs, and add this.Button2.Click += new System.EventHandler(this.Button2_Click); under InitializeComponent().
Or go to the code of your form, select InitializeComponent under the constructor, and press F12, and it will bring you to the right place.

Your code works perfectly but check if Button2_Click(object sender, EventArgs e) event is plugged.
Mehdi

How to add an event on a menu in C# project?

I have a C# Windows Forms App that contain a menu bar.
I want to display a Help Message when I press on the "HELP" menu button.
All that I can see when I press view code is this:
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
{
}
I think that I need to create inside the function a MessageBox or an event that will display the desired message.
Do you have any idea how should I do this, please?

Below should work for what your asking. If you are on your form you can double click the button you want to interact with, and Visual Studio should take you to the empty method.
private void helpToolStripMenuItem_Click(object sender, EventArgs e)
{
MessageBox.Show("This is supposed to be helpful");
}

How to close a form in UserControl

I created a UserControl with the buttons Save, Close and Cancel. I want to close the form without saving on the Cancel button, prompt a message to save on the Close button and Save without closing on the Save button. Normally, I would have used this.Close() on the Cancel button, but the UserControl doesn't have such an option. So I guess I have to set a property for that.
Scrolling down the "Questions that may already have your answer" section, I came across this question: How to close a ChildWindow from an UserControl button loaded inside it? I used the following C# code:
private void btnCancel_Click(object sender, EventArgs e)
{
ProjectInfo infoScreen = (ProjectInfo)this.Parent;
infoScreen.Close();
}
This does the job for one screen, but I wonder if I have to apply this code for all the screen I have? I think there should be a more efficient way. So my question is: Do I need to apply this code for every form I have, or is there another (more efficient) way?

you can use
((Form)this.TopLevelControl).Close();

you can use the FindForm method available for any control:
private void btnCancel_Click(object sender, EventArgs e)
{
Form tmp = this.FindForm();
tmp.Close();
tmp.Dispose();
}
Do not forget to Dispose the form to release resources.
Hope this helps.

You also can close one form in any part of the code using a remote thread:
MyNamespace.MyForm FormThread = (MyNamespace.MyForm)Application.OpenForms["MyForm"];
FormThread.Close();

I found the simple answer :) I all ready thought of something like that.
To close a WinForm in a ButtonClicked Event inside a UserControl use the following code:
private void btnCancel_Click(object sender, EventArgs e)
{
Form someForm = (Form)this.Parent;
someForm.Close();
}

Using Exit button to close a winform program

I have an exit button on a winform that I want to use to close the program. I have added the button name to the FormClosed property found in the events section of the winforms properties. I thought that's all I had to do but when I click the button it does not close. I looked at the code and while a handler is created, there is no code inside of it. I don't know if that is correct or not. Here is the code that was created in the Form.cs file:
private void btnExitProgram_Click(object sender, EventArgs e)
{
}
What else do I have to do?

this.Close();
Closes the form programmatically.

Remove the method, I suspect you might also need to remove it from your Form.Designer.
Otherwise: Application.Exit();
Should work.
That's why the designer is bad for you. :)

The FormClosed Event is an Event that fires when the form closes. It is not used to actually close the form. You'll need to remove anything you've added there.
All you should have to do is add the following line to your button's event handler:
this.Close();

We can close every window using Application.Exit();
Using this method we can close hidden windows also.
private void btnExitProgram_Click(object sender, EventArgs e)
{
Application.Exit();
}

Put this little code in the event of the button:
this.Close();

Try this:
private void btnExitProgram_Click(object sender, EventArgs e) {
this.Close();
}

Used Following Code
System.Windows.Forms.Application.Exit( )

In Visual Studio 2015, added this to a menu for File -> Exit and in that handler put:
this.Close();
but the IDE said 'this' was not necessary. Used the IDE suggestion with just Close(); and it worked.

If you only want to Close the form than you can use this.Close();
else if you want the whole application to be closed use Application.Exit();

You can also do like this:
private void button2_Click(object sender, EventArgs e)
{
System.Windows.Forms.Application.ExitThread();
}

Determine how an application is closed

I am trying to determine if my application is closed through clicking the "X" on the windows form, or if they clicked an "Exit" button I have on it. Right now I am using StackTrace.GetFrame(someIndex) to determine how, but i am looking for a more definitive way since it looks like these frame orders arent guaranteed. Is there a better way to make the distinction? This is a .NET 3.5 WinForm, and Im writing in C#.

Use a different event to handle your own "Exit" button click. In your own "Exit" event handler do your extra logic, or set some state variable, and then call the normal application close method.
Post some samples of how your events are wired up and I get give a more specific example. In general it would look something like this:
private void btnMyExit_Click(object sender, EventArgs e)
{
// TODO: add any special logic you want to execute when they click your own "Exit" button
doCustomExitWork();
}
public static void OnAppExit(object sender, EventArgs e)
{
doCustomExitWork();
}
private void doCustomExitWork()
{
// TODO: add any logic you want to always do when exiting the app, omit this whole method if you don't need it
}

Use the FormClosing event and query the FormClosingEventArgs for the enum CloseReason value.