Save Textbox to image

What version VB you have?

In VB.Net 2005 (or above) it is built-in:

Public Class Form1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim bmp As New Bitmap(TextBox1.Width, TextBox1.Height)
        TextBox1.DrawToBitmap(bmp, New Rectangle(New Point(0, 0), TextBox1.Size))
        PictureBox1.Image = bmp
    End Sub
 
End Class

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To save as a JPG (which PaulHews has already shown):

        Dim bmp As New Bitmap(TextBox1.Width, TextBox1.Height)
        TextBox1.DrawToBitmap(bmp, New Rectangle(New Point(0, 0), TextBox1.Size))
        bmp.Save("c:\someFile.jpg", System.Drawing.Imaging.ImageFormat.Jpeg)

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Excellent!

So I take it you have VB.Net 2003 or below?...