Develop Reference

WinForm closing when 'ok' is selected on messagebox

I have a mainform where you can open another window and change options. One of the options is to copy highlighted text to the clipboard. if the user doesn't highlight text and clicks btnCopy then I want a message to be shown that no text was highlighted. When the user selects 'ok' I want the messagebox to close but I want the 'options' window to stay open.
Right now when the user clicks 'ok' both the message box and 'options' window closes. Why is the 'options' window closing?
Here is my code:
private void btnCopy_Click(object sender, EventArgs e)
{
string copySearch = txtSavedSearches.SelectedText;
if (copySearch == "")
{
DialogResult dialog = MessageBox.Show("You did not select anything to copy. Please select the query to copy.", "Copy search", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
Clipboard.SetText(copySearch);
this.Close();
}
}

You obviously set the DialogResult property of btnCopy to something different than DialogResult.None.
If - in a Form that is not the application's main window - a Button is clicked that has the DialogResult property set (to something different than None), this click causes the Form to close and the calling ShowDialog() method to return that DialogResult.
Find out where you set that property and remove it.
From MSDN (Button.DialogResult):
If the DialogResult for this property is set to anything other than None, and if the parent form was displayed through the ShowDialog method, clicking the button closes the parent form without your having to hook up any events. The form's DialogResult property is then set to the DialogResult of the button when the button is clicked

Why is the 'options' window closing?
The following line will cause the options form to close:
this.Close();
You don't need to do anything to close a MessageBox; it goes away by itself when the user clicks OK, and then your code resumes running from the point where MessageBox.Show was called. MessageBox.Show is a method that returns a value denoting which button the user clicked to get the box to go away (the value varies depending on a) which buttons you chose to show as part of the call to .Show(...) and b) which button the user clicked
Right now when the user clicks 'ok' both the message box and 'options' window closes. Why is the 'options' window closing?
This cannot be, as the message box is shown in the do-if-true part of the IF, and the call to close the options form is called in the ELSE (do if false) part. These two parts cannot run in succession, they must be one or the other. Either your option form closes without a messagebox showing, or a messagebox shows and your form doesn't close
-
Edit:
Renee believes you have set this property:
on your btnCopy button to be something other than None
And then you have also opened your options form like this:
OptionsForm f = new OptionsForm();
f.ShowDialog();
These two things combined will conspire to cause your form options to close any time that btnCopy is clicked (unless the clickevent is canceled)

Handle button which has drill-down menu

So i have a UI that when you right click on a button, it opens a screen with 3 other buttons on it. How do i get the event system to not override the last button clicked (being what i right clicked to open the screen) when i click down on the button that is opened. The only way i can think to do it is to store the button that was right clicked in another variable. I was wondering if there was a way to prevent the event system from overriding the last button pressed. So that my code will run off what was right clicked and not the button that was clicked.

want to stop user input by messagebox but bypassed by a Enter keydown

I'm coding a windows form application running on a barcode scanner.
The plantform is .Net2.0CF/C#.
What i want is whenever user input wrong, the app will pop a messagebox and block the next input(actually,a scan action) until user click the OK on the screen.
But normally the user will continuously scan the next stuff as they didn't find anything went wrong, this will insert a Enter keydown so the messagebox will be closed, in one word, the messagebox does not stop the user.
How can i code this? Below is a very simple code snippet
private void tb_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode.ToString() == "Return")
{
if(!ValidateInput(tb.Text))
MessageBox.Show("Error");
}
}

You can create your own window (Form) that displays the error message, but does not react on the enter key.
It should contain a button which the user can click (as you wrote), however you need to make sure the button does not have focus when the window is displayed. (Because if it had focus, pressing the return key will "click" the button.)
A simple way for doing this is adding another control which has TabStop set to true (e.g. a textbox, another button) and which has a lower TabIndex property than the button.
Additionally, maybe you might want to do a
System.Media.SystemSounds.Beep.Play();
when showing the window to draw the user's attention to the window.

Show a tooltip on the Close (X) button on the form

I have a form, wherein I prohibit the user from closing it when the user clicks the Close (X) button. Is it possible to show a tooltip on the Close (X) button whenever it is clicked? I want to do it to notify the user why the form would not close.
I thought of a messagebox but then I thought it would be too annoying to close the messagebox every time you click the Close (X) button.
Is there a better way to notify the user, than what I'm trying to do?
EDIT:
This is my code for the FormClosing event
private void InputForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (e.CloseReason == CloseReason.UserClosing)
{
e.Cancel = true;
if (!mCloseReason)
{
e.Cancel = false;
}
}
}
I have a method that will save the inputs in the form. Once that method is finished, I need to automatically close the form. The if-statement will be true once I call this.Close(), this means I can't close the form. That's why I used a variable called mCloseReason to be able to close the form automatically. Now, that's why I was asking if I can notify the user through a tooltip once the Close (X) button is clicked.

I believe the default tooltip for the close(X) button is not editable without some hacking (and it is not practical).
Maybe what you could do is have a status field below your form, so when the user clicks the close button, it says in the status field "cannot close form (...)"
Or another idea is to have a message pop up somewhere on the form and go away after a little, indicating the form cannot be closed.
Another good idea was mentioned by Roger... just have a Close button somewhere on the form with a tooltip coded to it, and hide the forms' title bar?

How can I set up my winform button so that I can either click the button or press enter

I have some buttons on a winform that I would like to have the option of either clicking the button or press enter but I cannot figure out how to do it. Is it even possible?

Set the AcceptButton property on your form to the button you want.

If you want to make a button the default button on a form you should set the property AcceptButton.
In this way, if another control in your form has focus, pressing enter will close the form.
The same process is valid if you want a cancel button (a button connected to the Escape key). This time you set the CancelButton property on the form.