After i typed my ftp server ip address 'ftp://192.168.10.1/ in the textbox then clicked the button for display all files listed in the ftp. It shows the messages invalid url: the hostname cannot be parsed. But, I can view all my files in the web browser by typing the correct ftp address. By the way, I am using the ftpclient.dll for the.

Use the CopyDirectory method to copy a directory to another directory. This method copies the contents of the directory as well as the directory itself. If the target directory does not exist, it will be created. If a directory with the same name exists in the target location and overwrite is set to False, the contents of the two directories will be merged. You can specify a new name for the directory during the operation.

When copying files within a directory, exceptions may be thrown that are caused by specific file, such as a file existing during a merge while overwrite is set to False. When such exceptions are thrown, they are consolidated into a single exception, whose Data property holds entries in which the file or directory path is the key and the specific exception message is contained in the corresponding value.

To copy a directory to another directory

• Use the CopyDirectory method, specifying source and destination directory names. The following example copies the directory named TestDirectory1 into TestDirectory2, overwriting existing files.

  This code example is also available as an IntelliSense code snippet. In the code snippet picker, it is located in File system - Processing Drives, Folders, and Files. For more information, see Code Snippets.

Robust Programming

The following conditions may cause an exception:

• The new name specified for the directory contains a colon (:) or slash ( or /) (ArgumentException).

• The path is not valid for one of the following reasons: it is a zero-length string, it contains only white space, it contains invalid characters, or it is a device path (starts with .) (ArgumentException).

• The path is not valid because it is Nothing (ArgumentNullException).

• destinationDirectoryName is Nothing or an empty string (ArgumentNullException)

• The source directory does not exist (DirectoryNotFoundException).

• The source directory is a root directory (IOException).

• The combined path points to an existing file (IOException).

• The source path and target path are the same (IOException).

• ShowUI is set to UIOption.AllDialogs and the user cancels the operation, or one or more files in the directory cannot be copied (OperationCanceledException).

• The operation is cyclic (InvalidOperationException).

• The path contains a colon (:) (NotSupportedException).

• The path exceeds the system-defined maximum length (PathTooLongException).

• A file or folder name in the path contains a colon (:) or is in an invalid format (NotSupportedException).

• The user lacks necessary permissions to view the path (SecurityException).

• A destination file exists but cannot be accessed (UnauthorizedAccessException).

See also

The actual effect of the Imports statement in VB.NET is often a source of confusion for people learning the language. And the interaction with VB.NET References makes for even more confusion. We're going to clear that up in this Quick Tip.

Here's a brief summary of the whole story. Then we'll go over the details.

A Reference to a VB.NET namespace is a requirement and must be added to a project before the objects in the namespace can be used. (A set of references is automatically added for the different templates in Visual Studio or VB.NET Express. Click 'Show All Files' in Solution Explorer to see what they are.) But the Imports statement is not a requirement. Instead, it's simply a coding convenience that allows shorter names to be used.

Now let's look at an actual example. To illustrate this idea, we're going to use the System.Data namespace — which provides ADO.NET data technology.

System.Data is added to Windows applications as a Reference by default using the VB.NET Windows Forms Application template.

Adding a Namespace in the References Collection

Adding a new namespace to the References collection in a project makes the objects in that namespace available to the project as well. The most visible effect of this is that the Visual Studio 'Intellisense' will help you find the objects in popup menu boxes.

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If you attempt to use an object in your program without a Reference, the line of code generates an error.

The Imports statement, on the other hand, is never required. The only thing it does is allow the name to be resolved without being fully qualified. In other words (emphasis added to show the differences).

and

are both equivalent. But ..

results in a syntax error ('Type 'OleDbCommand' is not defined') because of the Imports namespace qualification System.Data doesn't provide enough information to find the object OleDbCommand.

Although the qualification of names in your program source code can be coordinated at any level in the 'apparent' hierarchy, you still have to pick the right namespace to reference. For example, .NET provides a System.Web namespace and a whole list of others starting with System.Web ..

Note

There are two entirely different DLL files for the references. You DO have to pick the right one because WebService isn't a method in one of them.