Show multiplication of number in tabular format

Form1.vb

Public Class NumberTabularFormate

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim i, j, k, l, r As Integer

        Dim str As String

        i = Convert.ToInt32(TextBox1.Text)

        j = Convert.ToInt32(TextBox2.Text)

        ListBox1.Items.Clear()

       

        For k = 1 To 10

            str = ""

            For l = i To j

                r = k * l

                str = str + r.ToString() & vbTab

            Next

            ListBox1.Items.Add(str)

        Next

    End Sub

End Class

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