Problem Multi Form Application

Question

Hello

I am developping an application with five form (not MDI form), and I would like manupilate all this form from the main form (The main form),

my question is : how to close these forms from the main form

Best regard

Kumar AG · Answer

public partial class MainForm : Form { public MainForm() { InitializeComponent(); } //You are getting the error because you have declared Form variables with in the method //And trying to access them from other method //Variable for form1 is is out of scope in second method and similarly others //Declare the variables at class level to access it from all the methods Form1 SR; Form2 SCRI; Form3 CF; private void btn_Rechange_Click( object sender EventArgs e) { //Check if the form1 already open/Exists if exists get the form1 object else create a new form1 object SR = ( Form1 ) Application .OpenForms[ Form1 ]; if (SR == null ) SR = new Form1 (); SR.Show(); //Check if form2 is already open/exists if exists close SCRI = ( Form2 ) Application .OpenForms[ Form2 ]; if (SCRI != null ) SCRI.Close(); //You can also use Hide method //Check if form3 is already open/exists if exists close CF = ( Form3 ) Application .OpenForms[ Form3 ]; if (CF != null ) CF.Close(); } //Similarly for other forms also private void btn_CRI_Click_Click( object sender EventArgs e) { SCRI = ( Form2 ) Application .OpenForms[ Form2 ]; if (SCRI == null ) SCRI = new Form2 (); SCRI.Show(); SR = ( Form1 ) Application .OpenForms[ Form1 ]; if (SR != null ) SR.Close(); CF = ( Form3 ) Application .OpenForms[ Form3 ]; if (CF != null ) CF.Close(); } private void btn_Config_Click( object sender EventArgs e) { CF = ( Form3 ) Application .OpenForms[ Form3 ]; if (CF == null ) CF = new Form3 (); CF.Show(); SR = ( Form1 ) Application .OpenForms[ Form1 ]; if (SR != null ) SR.Close(); SCRI = ( Form2 ) Application .OpenForms[ Form2 ]; if (SCRI != null ) SCRI.Close(); } }

djelloul reguieg · Answer

Thank you very much that's exactly what I looked

djelloul reguieg · Answer

hello thank you for your response but i would llike close Form1 when Form2 is open and Close Form2 when Form3 is open....see exemple below; private void btn_Rechange_Click( object sender EventArgs e) { Form1 SR = new Form1 (); SR.Show( ); CF.Close(); SCRI.Close(); } private void btn_CRI_Click( object sender EventArgs e) { Form2 SCRI = new Form2 (); SCRI.Show( ); CF.Close(); SR.Close(); } private void btn_Config_Click( object sender EventArgs e) { Form3 CF = new Form3 (); CF.Show( ); SR.Close(); SCRI.Close(); } this error is displayed : Erreur 3 Le nom 'CF' n'existe pas dans le contexte actuel or Error 3 the name CF is not exist; that's my problem if you have a response I would be very grateful

Stefan · Answer

To close them from the main form just call the Close() method of the form. Example: form1.Close();.