Verifies the value of the control losing focus by causing the
System.Windows.Forms.Control.Validating and
System.Windows.Forms.Control.Validated events to occur, in that order.
'宣言
Public Overloads Function Validate() As Boolean
戻り値の型
true if validation is successful; otherwise,
false. If called from the
System.Windows.Forms.Control.Validating or
System.Windows.Forms.Control.Validated event handlers, this method will always return
false.