Foreach Control in form, how can I do something to all the TextBoxes in my Form?

Question

How can I use a Foreach Statement to do something to my TextBoxes?

foreach (Control X in this.Controls)
{
    Check if the controls is a TextBox, if it is de         


        

Answer 1

The trick here is that Controls is not a List<> or IEnumerable but a ControlCollection.

I recommend using an extension of Control that will return something more..queriyable ;)

public static IEnumerable All(this ControlCollection controls)
    {
        foreach (Control control in controls)
        {
            foreach (Control grandChild in control.Controls.All())
                yield return grandChild;

            yield return control;
        }
    }

Then you can do :

foreach(var textbox in this.Controls.All().OfType)
{
    // Apply logic to the textbox here
}