In, how do I set a font size when creating a text box programmatically?

I am programming in with Visual Studio 2015 Community. I am using the code below to programmatically create a text box. My question is - How can I set the text font size when the box is created. I looked around and found the code between the asterisks below, but I'm getting a compile error saying that Font is ambiguous. This is occurring for the first Font in the using f as Font statement and also the Font after the New in the following line. I'm very new to programming in vb and would appreciate any help you could give. Thanks.

        tbnum.Location = New System.Drawing.Point(30, tvposition)
        tbnum.Size = New Size(45, 20)
        Using f As Font = tbnum.Font
            tbnum.Font = New Font(f.FontFamily, f.Size + 2, f.Style)
        End Using
        tbnum.Text = panposition.ToString
        tbnum.Name = "tbnum" + panposition.ToString
        tbnum.AllowDrop = True
        tbnum.TabStop = False
        tbnum.TextAlign = HorizontalAlignment.Right
        tbnum.BackColor = ColorTranslator.FromHtml(myYellow)
        tbnum.ReadOnly = True
        tbnum.Enabled = False

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Najam UddinCommented:
Dim objFont As System.Drawing.Font
objFont = New System.Drawing.Font(tbnum.Font.FontFamily, tbnum.Font.Size + 2, f.Style)
tbnum.Font = objFont

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johnrosshAuthor Commented:
Thanks Najam. I had to get rid of the parameter but once I did that, it worked perfectly. What about bolding the text? How would I do that?
Najam UddinCommented:
objFont = New System.Drawing.Font(tbnum.Font.FontFamily, tbnum.Font.Size + 2,FontStyle.Bold)

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