تغيير لون خط الأطار الخارجي لل Textbox ( إذا امكن )

يمكنك إزالة الإطار الاعتيادي من مربع النص عن طريق تغيير خاصية BorderStyle إلى None

و الاعتماد على كود كالتالي لإنشاء الإطار الملون

   Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
		Dim g As Graphics = e.Graphics
		Dim Rect As New Rectangle(Me.TextBox1.Location, Me.TextBox1.Size)
		Dim pen As New Pen(Color.Aqua, 3)

		g.DrawRectangle(pen, Rect)
	End Sub

وبعدين اضف الكود التالي للفورم

 Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint



			 Dim linGrBrush As New LinearGradientBrush(New Point(0, 10), New Point(200, 10), Color.Red, Color.Blue)

			 Dim pen As New Pen(linGrBrush, 5)

			   Dim g As Graphics = e.Graphics

			 Dim Rect As New Rectangle(TextBox1.Location, TextBox1.Size)

				g.DrawRectangle(pen, Rect)


	   End Sub