Programming Tutorials

File operations in VB.net

By: Issac  

File class is using for the File operations in VB.NET. We can create, delete, copy etc. operations do with File class.

How to create a File? 

In order to create a new File, we can call Create method in the File class.
Syntax : File.Create(FilePath)
FilePath : The name of the new File Object 
File.Create("c:\testFile.txt")

How to check a File exist or not? 

Before we create File object, we usually check that File exist or not. For that we are using the Exists method in the File class.
Syntax: File.Exists (FilePath) as Boolean
FilePath: The name of the File
Boolean: Returns true or false, if File exist it Returns true else Returns false 
VB.NET: File.Exists ("c:\testFile.txt")

The following VB.NET source code shows these operations:
Imports System.IO
Public Class Form1
Private Sub Button1_Click (ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
If File.Exists("c:\testFile.txt") Then
'shows message if testFile exist
MsgBox("File 'testFile' Exist ")
Else
'create the file testFile.txt
File.Create("c:\testFile.txt")
MsgBox("File 'testFile' created ")
End If
End Sub
End Class

When you run this source code, it first checks whether the File exists or not, If exist it shows message file exist, else it create a new File Object.

How to Copy a File? 

If we want the Copy of the File Object we can use the Copy method in File class.
Syntax : Copy(sourceFileName, destFileName)
sourceFileName : The source file we want to move.
destFileName: The destinations file name. 
VB.NET: File.Copy ("c:\testFile.txt", "c:\testDir\testFile.txt")

How to delete a File Object? 

If you want to delete a File Object we can use the Delete methods in the File class
Syntax: Delete(FilePath)
DirPath: The File Object you want to delete. 
VB.NET: File.Delete ("c:\testDir\testFile.txt")

The following VB.NET source code shows these operations:

Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
If Not File.Exists("c:\testFile.txt") Then
MsgBox("FIle not exist ")
Else
File.Copy("c:\testFile.txt", "c:\testDir\testFile.txt")
MsgBox("File Copied ")
File.Delete("c:\testFile.txt")
MsgBox("file deleted ")
End If
End Sub
End Class
When you run this code first it checks whether the file exist or not , if it does not exist it shows message “file does not exist”, if it exists it is copied to testDir directory and deleted from the c:\.

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