Use of Left and Right Function in String

Public Class Form1
    Dim t1 As String
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        t1 = TextBox1.Text
        TextBox2.Text = Microsoft.VisualBasic.Left(t1, 4)
        TextBox3.Text = Microsoft.VisualBasic.Right(t1, 4)

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class