Opening a form


	frmConfiguration ConfigForm = new frmConfiguration();
	ConfigForm.PassedValue1 = "This is a string I'm passing";

	//TO OPEN AS A DIALOG FORM:
	ConfigForm.ShowDialog();
	//or
	if (ConfigForm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
	else if (ConfigForm.DialogResult == System.Windows.Forms.DialogResult.Cancel)

	//TO OPEN NOT AS A DIALOG FORM:
	ConfigForm.Show();

Closing a form


	Close();
	//or
	this.Close();

Closing a form from the Form Load Event

You can't use this.Close as the form has not yet finished loading so if you do you'll cause fatal error. Instead use this:


	this.BeginInvoke(new MethodInvoker(this, System.Windows.Forms.Form.Close));

Dynamically updating Form Properties

Use this instead of the forms name:

	this.Text = "A New Title For This Form";

To Disable A Form


	//This form
	this.Enabled = false;
	//Another form
	frmMyForm.Enabled = false;

Why Is A Form Closing?

You can use things like this (see the CloseReason members):

if (e.CloseReason == System.Windows.Forms.CloseReason.UserClosing)

Supressing Display Update Of A Form

You can't stop a form being painted, but you can do this:


	this.SuspendLayout();
	MyControlName1.SuspendLayout();
	MyControlName2.SuspendLayout();
	...
	MyControlName1.ResumeLayout();
	MyControlName2.ResumeLayout();
	this.ResumeLayout();

You can also make specific controls invisible

Default Accept and Cancel Buttons

Set in the forms AcceptButton and CancelButton properties.
Set Dialog result for each button

Returning a Dialog Result

You can assign a dialog result value to buttons on the form in their properties.

Stopping A Form / Application From Closing

Handle the form's 'Closing' event and set 'e.Cancel' to 'True' if you want to prevent the form from closing.
e.Cancel = true;
If your going to present a message box, such as a 'do you want to save' then you need to do the cancel first to stop the ap closing while waiting for the user input. Then afterwards do the close.

 

 

Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.

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