problem with multiple forms

Question

hi I have a form let's say Form1 On Form1 I have a button let's say button1. When I press this button I launch another form let's say Form2. However when I press the button again Form2 is launched again. So I have 2 Form2 on the screen. I had tried with singleton design pattern for Form2 but I have compiler errors due to potection level in Form2. Could you help me please ? I don't know how to do it :( Any help appreciated. Thx  Adisor

alobiuc · Answer

Probably in your eventhandler for button1 you have declared a variable of type Form2 which gets instanciated whenever the button is pressed. Something like Form2 form2=new Form2(); If this is the case declare the variable as global and before instanciating it check if it is null. If it is go ahead and instanciate it. Otherwise do nothing or whatever you think appropriate: //... Form2 form2=null; //... protected void EventHandler buton1_Click(object sender System.EventArgs e) { if(form2==null) form2=new Form2(); else MessageBox.Show(Form already exists); }