DataGridView1

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        For Each tb In Controls.OfType(Of TextBox)()
            DataGridView1.Rows.Add(tb.Text)
        Next
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Dim tbs As New List(Of TextBox) From {TextBox1, TextBox2, TextBox3, TextBox4, TextBox5, TextBox6, TextBox7, TextBox8}
        For Each tb As TextBox In tbs
            DataGridView1.Rows.Add(tb.Text)
        Next
    End Sub