The FileStream Class represents a File in the Computer. FileStream allows to move data to and from the stream as arrays of bytes. We operate File using FileMode in FileStream Class

Some of FileModes as Follows :

FileMode.Append : Open and append to a file , if the file does not exist , it create a new file

FileMode.Create : Create a new file , if the file exist it will append to it

FileMode.CreateNew : Create a new File , if the file exist , it throws exception

FileMode.Open : Open an existing file

How to create a file using VB.NET FileStream ?

The following example shows , how to write in a file using FileStream.

Imports System.IO
Imports System.Text
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, _
	ByVal e As System.EventArgs) Handles Button1.Click
        Try
            Dim wFile As System.IO.FileStream
            Dim byteData() As Byte
            byteData = Encoding.ASCII.GetBytes("FileStream Test1")
            wFile = New FileStream("streamtest.txt", FileMode.Append)
            wFile.Write(byteData, 0, byteData.Length)
            wFile.Close()
        Catch ex As IOException
            MsgBox(ex.ToString)
        End Try
    End Sub
End Class