03 use a Button to open another frm, buttonfrm

03 use a Button to open another frm, buttonfrm

Private void form=formclosing (object sender, FormClosingEventArgs e) {DialogResult re = MessageBox. show ("are you sure you want to leave", "Ask", MessageBoxButtons. yesNo, MessageBoxIcon. question); if (re = DialogResult. no) {e. cancel = true ;}} private void button#click (object sender, EventArgs e) {this. close (); // click this button to Close the window} private void button2_Click (object sender, EventArgs e) {Form2 frm = new Form2 (); frm. showDialog (); // The form in the showdialog mode. to close the main form, you must first close the modal form // frm. show (); // show you can click the main window again to open countless windows without forcing them to stay in the new window}