Gets or sets a value indicating whether pressing ENTER in a multiline System.Windows.Forms.TextBox control creates a new line of text in the control or activates the default button for the form.
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If the value of this property is false, the user must press CTRL+ENTER to create a new line in a multiline System.Windows.Forms.TextBox control. If there is no default button for the form, the ENTER key will always create a new line of text in the control, regardless of the value of this property.