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The IO classes in the IO Class Library provide the basic functionality for all input/output functionality of an application -- reading or writing a file, accessing a directory, checking file access permissions, etc. This example demonstrates how to read from a file using the FileStream and StreamReader classes:
Imports System Imports System.IO Imports Microsoft.VisualBasic Class ReadFile Shared Sub Main() 'Declare a file stream object Dim o As FileStream 'Declare a stream reader object Dim r As StreamReader 'Open the file o = New FileStream("c:myfile.txt", FileMode.Open,FileAccess.Read, FileShare.Read) 'Read the output in a stream reader r = New StreamReader(o) 'Display the content of the file msgbox(r.ReadtoEnd) End Sub End Class