C#

public class SingletonClass
{
    SingletonClass instance;

    private SingletonClass()
    {
        // Initialization code
    }

    public static SingletonClass GetInstance()
    {
        if (instance = null)
            instance = new SingletonClass();
        
        return instance;
    }
}

Legolas_Bilbao wrote:

but in new GestorBD(), i´d like to pass a parameter how can i do it??becouse i received "0" or "1" i have to read and xml or other xml

// constants for menu manipulation
const int SC_CLOSE = 0xF060;
const int MF_BYCOMMAND = 0x0;

[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern IntPtr RemoveMenu(IntPtr menuHwnd, int position, int flags );

[System.Runtime.InteropServices.DllImport("user32.dll")]
public static extern IntPtr GetSystemMenu(IntPtr hwnd, int bRevert);

public static void EnableApplicationClose( System.Windows.Forms.Form form, bool val )
{
	IntPtr menu = GetSystemMenu( form.Handle, val ? 1 : 0 );
	if ( !val && menu != IntPtr.Zero )
		RemoveMenu( menu, SC_CLOSE, MF_BYCOMMAND );
	else
	{
		// needed when enabling the app close box to force it to redraw.
		form.Enabled = false;
		form.Enabled = true;
	}
}