How to make a textbox stretch to its parent window's width in C#?

Question

I have a TextBox which I would like to have stretch to its parent's Width.

I tried anchoring Top, Left, Right but that only goes just over about 60%, any ideas?

Answer 1

As Hans Passant said in a comment, but anchor to the left as well.

Or, if you want to do it programmatically:

textBox1.Width = textBox1.Parent.Width;
textBox1.Location = new Point(0,textBox1.Location.Y);
textBox1.Anchor = AnchorStyles.Left | AnchorStyles.Right;