We Keep Coding

Close button c# windows forms

I am trying to close the app by clicking one button but it's not working.
this is my code.
private void buttonclose_Click(object sender, EventArgs e)
{
Application.Exit();
}

Like #Dialecticus said, it could be that you never registered the event handler. In your form designer, when you double click the button it will register the click event for you automatically. If you didn't do that and your code was just copy/pasted you would have to go into the events to "wire" them yourself.
If that's not your issue, you could try using Environment.Exit() or this.Close() instead.

Use this Code, it will diffidently work
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}

C# WinForms - Detect User Click Into Text Box

I have been developing a windows form application and ran into a problem.
After trying various things (Listed below) I have come to seek your knowledge to help point me in the right direction.
I have replicated a much simpler version of my program:
As you can see, I have two textboxes. I want to be able to click on the textbox on the bottom (textbox1) and call some form of an event, in this case, for simplicity, pop up a message box.
I have been through the events listed here:
https://msdn.microsoft.com/en-us/library/system.windows.forms.textbox_events(v=vs.110).aspx
And implemented them into my code as I expected one of them to work. However, this is not the case.
private void textBox1_TextChanged(object sender, EventArgs e)
{
MessageBox.Show("TextBox Entered");
}
//Above - Will pop message box when text entered.
private void textBox1_GotFocus(object sender, EventArgs e)
{
MessageBox.Show("TextBox Entered");
}
private void textBox1_Enter(object sender, EventArgs e)
{
MessageBox.Show("TextBox Entered");
}
private void textBox1_Click(object sender, EventArgs e)
{
MessageBox.Show("TextBox Entered");
}
Does anybody know what I am missing? I presume what I am trying to achieve is actually possible?
Kind Regards,
B.

Ensure the event is subscribed to the methods you have written. You can do this in the design view using the Events tab of the property window (looks like a lightning bolt). As mentioned by others, a double click in the events window will generate the event's method for you, and subscribe to it automatically.
Another way is to subscribe directly using code; you could write this in the form constructor for example:
textBox1.TextChanged += textBox1_TextChanged;

Properly Closing Secondary Form VS Application Exit

This is probably going to be a standard question. I have read lots of articles on this but none point out the issue i am having specifically.
I am developing a WinForm and have a "Main Menu" form that is loaded on startup. Within this main are several buttons which open up individual modules (other forms) of the program.
I can open up the form no problem and can close it and re-show the main form no problem. The problem lies when a user hits the (X) in the control box, the application doesnt exit because the main form is still there, but hidden. I know that i could put an application.exit() in the close event of the form. However, then if i have a button that closes the form and wants to unhide the main form, the application will close due to the formclosing event.
Can someone help me understand this principle. I dont think it should be as hard as it seems to me and i dont really want to use Panels.
Thanks in advance.
-Joseph
the following code solved the issue based on the answer provided below
private void btnHome_Click(object sender, EventArgs e)
{
Form f1 = Application.OpenForms[0];
f1.Visible=true;
this.Close();
}
private void frmCostControlMain_FormClosed(object sender, FormClosedEventArgs e)
{
Form f = Application.OpenForms[0]; // The main form
if (f.Visible==true)
{
f.BringToFront();
}
else
{
Application.Exit();
}
}

You can check the Application.OpenForms and see whether some non-hidden forms other than the current form are around. If you only want to check the main form, you can check Application.OpenForms[0]. Since it was opened first, it will always be at index 0. From memory:
Form_Closed(object sender, EventArgs e)
{
Form f = Application.OpenForms[0]; // The main form
if (f.Visible) {
f.BringToFront();
} else {
Application.Exit();
}
}
When the close button is clicked you would first unhide the main form and then close the current form.

I still don't understand your question, but I guess you could use the
Application.Exit().
You should then check the arguments of your FormClosed event.
The Close reason is as follows:
Click on [X]:
CloseReason = UserClosing
Application Exit:
CloseReason = ApplicationExitCall
You could then handle it properly
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
if (e.CloseReason == CloseReason.ApplicationExitCall)
{
//Application.Exit();
}
else if (e.CloseReason == CloseReason.UserClosing)
{
//[X] was pressed
}
else
{
//Many other reasons
}
}
I guess there is a much cleaner way of handling your problem. If you provide a bit more details, I think someone would be able to help you along.

C# User Control Leave Event

I am very new with the C# UserControl. I have problems with the event Leave. This is my situation: I would like to go from usercontrolA to userControlB. Before going to userControlB, usercontrolA_Leave event is called.
private void usercontrolA_Leave(object sender, EventArgs e)
{
MessageBox.Show("you are leaving.....");
}
After MessageBox is shown, the program will not proceed to my userControlB. HOWEVER when there is no MessageBox in the code, the program can proceed to userControlB.
private void usercontrolA_Leave(object sender, EventArgs e){//anything but MessageBox}
In my case, I need MessageBox.
I need MessageBox(or other thing) for me to decide whether staying or leaving.. .
msdn Control.Leave Event
I heard about setting set focusor lost focus. Is that possible to use this?
I hope you guys could understand what I have written. Thank you in advance.. :)

You will not be able to preserve mouse movements once a MessageBox is created. This is a modal box that comes up on top of the existing window and takes the focus away from the current form and interrupts the mouse.
Consider an option that does not interrupt the mouse, such as writing out to a textbox. Create a TextBox will the multi-line and scrollbar options enabled. Then write to it.
private void usercontrolA_Leave(object sender, EventArgs e)
{
textBox1.Append("you are leaving A...\r\n");
}
private void usercontrolB_Enter(object sender, EventArgs e)
{
textBox1.Append("you are entering B...\r\n");
}

How does a Windows Forms control know when its form was (de)activated?

I have a Windows Forms application in C# .NET. It contains a user-drawn control that also handles the keyboard focus. If a part of the control has the focus, a focus highlight border is painted around it. When the form that contains the control is deactivated, the focus border must disappear from the control, obviously. But the control doesn't even get a notification about it. It only receives the "Leave" event when another control is focused, not another window. How can the control know about that?

When the Form+Control are loaded, the Control can subscribe to the Activate and DeActivated events of the Form.
If it is a UserControl, you have the Control.Load event to do this. For a CustomControl I would have to look it up.
Anyway, be sure to implement Dispose in your Control to unsubscribe to the events.
Just gave it a try:
private void UserControl1_FormActivate(object sender, EventArgs e)
{
label1.Text = "Acitve";
}
private void UserControl1_FormDeActivate(object sender, EventArgs e)
{
label1.Text = "InAcitve";
}
private void UserControl1_Load(object sender, EventArgs e)
{
this.ParentForm.Activated += UserControl1_FormActivate;
this.ParentForm.Deactivate += UserControl1_FormDeActivate;
}