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Use the TextBoxBase.ShortcutsEnabled property to enable or disable the following shortcut key combinations and the control’s shortcut menu:
CTRL+Z
CTRL+E
CTRL+C
CTRL+Y
CTRL+X
CTRL+BACKSPACE
CTRL+V
CTRL+DELETE
CTRL+A
SHIFT+DELETE
CTRL+L
SHIFT+INSERT
CTRL+R
You can override this property to specify other shortcut keys.
The System.Windows.Forms.TextBox control does not support the CTRL+A shortcut key when the TextBox.Multiline property value is true.