How to: Create a File in Visual Basic
This example creates an empty text file at the specified path using the Create method in the File class.
Example
Imports System
Imports System.IO
Imports System.Text
Module Module1
Sub Main()
Dim path As String = "c:\temp\MyTest.txt"
' Create or overwrite the file.
Dim fs As FileStream = File.Create(path)
' Add text to the file.
Dim info As Byte() = New UTF8Encoding(True).GetBytes("This is some text in the file.")
fs.Write(info, 0, info.Length)
fs.Close()
End Sub
End Module
Compiling the Code
Use the file variable to write to the file.
Robust Programming
If the file already exists, it is replaced.
The following conditions may cause an exception:
The path name is malformed. For example, it contains illegal characters or is only white space (ArgumentException).
The path is read-only (IOException).
The path name is Nothing (ArgumentNullException).
The path name is too long (PathTooLongException).
The path is invalid (DirectoryNotFoundException).
The path is only a colon ":" (NotSupportedException).
Security
A SecurityException may be thrown in partial-trust environments.
The call to the Create method requires FileIOPermission.
An UnauthorizedAccessException is thrown if the user does not have permission to create the file.