Here is a code snippet to address a common problem to use simple text files using System.IO in ASP.NET:
'Open a file for reading
Dim FILENAME As String = Server.MapPath("Data.txt")
'Get a StreamReader class
Dim objStreamReader As System.IO.StreamReader
objStreamReader = System.IO.File.OpenText(FILENAME)
'Read the entire file into a string
Dim contents As String = objStreamReader.ReadToEnd()
'Optionally you may wish to replace carraige returns with <br>s
TextBox1.Text = contents.Replace(vbCrLf, "<br>")
objStreamReader.Close()
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