ขอวิธีปิดการคลิกขวา copy / paste ลงใน textbox หน่อยคับขอบคุณครับ

TextBox1.ContextMenu = New ContextMenu()

Protected Overrides Function ProcessCmdKey(ByRef msg As Message, ByVal keyData As Keys) As Boolean
        If keyData = (Keys.Control Or Keys.V) Then
            Return True
        Else
            Return MyBase.ProcessCmdKey(msg, keyData)
        End If
    End Function

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        TextBox1.ContextMenu = New ContextMenu()
    End Sub

    Protected Overrides Function ProcessCmdKey(ByRef msg As Message, ByVal keyData As Keys) As Boolean
        If keyData = (Keys.Control Or Keys.V) Then
            Return True
        Else
            Return MyBase.ProcessCmdKey(msg, keyData)
        End If
    End Function

End Class