CopyFile Function in VB.Net

Imports System.IO

Function CopyFile(ByVal sSourceFile As String, ByVal sDestnFile As String)

Dim oFile As New FileInfo(sSourceFile)

If oFile.Exists Then

oFile.CopyTo(sDestnFile)

Else

MsgBox("File Does not exist")

End If

End Function

Use the FileInfo class for typical operations such as copying, moving, renaming, creating, opening, deleting, and appending to files.

Many of the FileInfo methods return other I/O types when you create or open files. You can use these other types to further manipulate a file. For more information, see specific FileInfo members such as Open, OpenRead, OpenText, CreateText, or Create.

If you are going to reuse an object several times, consider using the instance method of FileInfo instead of the corresponding static methods of the File class, because a security check will not always be necessary.

By default, full read/write access to new files is granted to all users.

The following table describes the enumerations that are used to customize the behavior of various FileInfo methods.

Enumeration		Description
FileAccess		Specifies read and write access to a file.
FileShare		Specifies the level of access permitted for a file that is already in use.
FileMode		Specifies whether the contents of an existing file are preserved or overwritten, and whether requests to create an existing file cause an exception.
Note:
In members that accept a path as an input string, that path must be well-formed or an exception is raised. For example, if a path is fully qualified but begins with a space, the path is not trimmed in methods of the class. Therefore, the path is malformed and an exception is raised. Similarly, a path or a combination of paths cannot be fully qualified twice. For example, "c:\temp c:\windows" also raises an exception in most cases. Ensure that your paths are well-formed when using methods that accept a path string.

In members that accept a path, the path can refer to a file or just a directory. The specified path can also refer to a relative path or a Universal Naming Convention (UNC) path for a server and share name. For example, all the following are acceptable paths:

· "c:\\MyDir\\MyFile.txt" in C#, or "c:\MyDir\MyFile.txt" in Visual Basic.

· "c:\\MyDir" in C#, or "c:\MyDir" in Visual Basic.

· "MyDir\\MySubdir" in C#, or "MyDir\MySubDir" in Visual Basic.

· "\\\\MyServer\\MyShare" in C#, or "\\MyServer\MyShare" in Visual Basic.

It is always a good practice to check the existence of the file with Exists property before performing operations

If oFile.Exists Then

oFile.CopyTo(sDestnFile)

Exists will return true if the file exists; false if the file does not exist or if the file is a directory.