File stream operations in VB.net

By: Issac in VB.net Tutorials on 2009-01-30

The FileStream class allows us to move data to and from the stream as arrays of bytes, a filestream actually symbolizes a a file in a system. We operate File using FileMode in FileStream Class

Some of the FileModes are as Follows :

FileMode.Append: It opens and appends to a file, if the file does not exist, it creates a new fileFileMode.Create: Creates a new file, if the file already exists it will appends to it.FileMode.CreateNew: Creates a new file, if the file exists it throws an exception.FileMode.Open: Opens 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

When we execute the program, it creates a new File and writes the content to it.

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