Restriction of length in TextBox

[Kadir]

I want to limit it. TextBox length of input. Maximum 6.

1. In Yours MaxLength Yes. 6♪

2. In the code. tb_display.MaxLength = 6;but nothing helps.

[Cleofas]

MaskedTextBox can be used for the introduction.

var f = new Form();
var t = new MaskedTextBox() { Parent = f, Dock = DockStyle.Fill };
t.Mask = "AAAAAA";  // не больше 6-ти цифр или букв
f.ShowDialog();

The meaning of Mask is drawn from masking language -- https://msdn.microsoft.com/en-us/library/ms234064.aspx