Question

When I create & add a control to my WinForm using the designer, is my control automatically added to a collection with all the others somewhere ?

Let’s say there are like 20 TextBox and I need to clear them all at the same time without calling it like so :

txtbox1.Clear();
txtbox2.Clear();
txtbox3.Clear();
...

I know I should have created manually each control without the designer and add them in a collection but it’s too late for that now. So any idea if I can access the whole group of controls ?

Answer 1

try this

private void ClearTextBoxes()
{
 Action<Control.ControlCollection> func = null;

 func = (controls) =>
     {
         foreach (Control control in controls)
             if (control is TextBox)
                 (control as TextBox).Clear();
             else
                 func(control.Controls);
     };

 func(Controls);
}