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[Resolvido] Dúvida sobre "CType(sender, Button)"

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Estou a fazer um pequeno jogo da memória e gostaria de saber para que serve o código CType(sender, Button) no seguinte contexto:

Dim botaocorreto As Button = CType(sender, Button)
 If vnumeros(vcontador) = botaocorreto.Text Then
	 Botoes(vnumeros(vcontador)).BackColor = Color.LightGreen
	 If vcontador = vnivel Then
		 Timer2.Enabled = True
		 vcontador = vcontador + 1
	 End If

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O CType converte um objecto para um determinado tipo de dados, se possível. Nesse caso, estás a converter "sender", que é um Object, numa instância da classe Button.

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