如何在VB中制作一个自动打字器，而不是简单地输入一块文本，如何逐个字母地输入？

Public Class Form1
    Dim textToType As String
    Dim currentIndex As Integer

    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        If currentIndex < textToType.Length Then
            TextBox1.Text += textToType(currentIndex)
            currentIndex += 1
        Else
            Timer1.Stop()
        End If
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        textToType = "Hello, World!"
        currentIndex = 0
        TextBox1.Text = ""
        Timer1.Start()
    End Sub
End Class