Read from a text file using the FileStream StreamReader class (ASP.NET)

If you're writing to text files in .NET, chances are there will come a time when you want to read from those text files as well. To accomplish this task, you'll need to use the StreamReader class. The StreamReader class is a member of the FileStream class, which provides all the functionality you need to read and write data to text files.


The following code reads one line from a text file:

       Dim fs As System.IO.FileStream
       Dim sr As System.IO.StreamReader
       fs = New System.IO.FileStream("c:\txtfile.txt", _
            System.IO.FileMode.Open)
       sr = New System.IO.StreamReader(fs)

   Response.Write(sr.ReadLine & "<br>")

       sr.Close()

To read all the lines in a text file, use ReadLine to obtain the first line, then place a second call to ReadLine inside a loop. Read until the method returns an empty string, like so:

       Dim st As String
       Do
            st = sr.ReadLine
            Response.Write(st & "<br>")
       Loop Until st = ""