Question

How can I enable/disable an asp.net form/controls selectively or entirely from code-behind?

The following code is not working. Coz there is no Enabled property in this case.

public static void Disable(Page container)
{
    for (int i = 0; i < container.Controls.Count; i++)
    {
        container.Form.Controls[i].Enabled = false;
    }
}

Answer 1

Only the controls that inherit from WebControl will have a Enabled property. So you could do something like this inside your loop:

var webControl = container.Form.Controls[i] as WebControl;
if(webControl != null) {
    webControl.Enabled=false;
}