How does one select all text in a Windows Forms TextBox?

Question

How do I allow select all in my multi-lined TextBox?

It seems weird to me that there would not be a way to do this; there should be something in the framework out of the box.

Answer 1

In case of Windows Forms:

textbox.SelectAll();

Answer 2

How about textbox1.SelectAll()?

You can also use

textbox1..Select(0, textbox1.Text.Length);

and turn property HideSelection to False.

Answer 3

Try the SelectAll method (actually located on TextBoxBase).

TextBoxBase b = GetTheTextBox();
b.SelectAll();