VB Revit HelloWorld

HelloWorldCommand.vb

Imports Autodesk.Revit.Attributes
Imports Autodesk.Revit.DB
Imports Autodesk.Revit.UI

Namespace Command

    <Transaction(TransactionMode.Manual)>
    <Regeneration(RegenerationOption.Manual)>
    Public Class HelloWorldCommand
        Implements IExternalCommand

        Public Function Execute(
                                commandData As ExternalCommandData,
                                ByRef message As String, 
                                elements As ElementSet) As Result Implements IExternalCommand.Execute
            TaskDialog.Show("Hello World!", "Hello World!")
            Return Result.Succeeded
        End Function
    End Class
End NameSpace