Removing Hidden System Shares

هذه المقالة متوفرة أيضا باللغة العربية، اقرأها هنا.


Contents of this article:

  • Contents
  • Introduction
  • The Net Command (net.exe)
  • Starting Net Command
  • Listing Current Shares
  • Sharing a Resource
  • Removing a Share
  • Net Command Help


Although, Windows helps you managing system shares via a great deal of tools and applications, it creates hidden shares for all your disk drives after you install a new fresh copy of Windows that are hidden and not accessible via these tools.

What does “hidden” means? It means that these shares are neither shown to the user nor marked with the sharing mark in Windows Explorer. Plus, they are not accessible via common tools like Computer Management MMC snap-in. Instead, you can control those shares only via command-line instructions. These shares are also hidden from other computers in the network. However, other users can access your computer via these shares using very simple instructions.

Why keeping these shares are considered very dangerous? Imagine what if some user in the network accesses your disk drives by writing a simple line like \C$ (to access the C: drive) in the Run utility (in the Start menu.) At least, he can steal your personal information and data and expose them to danger.

The Net Command (net.exe)

Windows comes with a very nice utility, Net Command (net.exe,) that is used for many purposes. We are not going to cover all uses of Net Command since it requires plenty of articles not one! Instead, we are going to talk about only one use of the Net Command; it is the Sharing Manager.

Starting the Net Command

Unfortunately, Net Command utility does not include a GUI (Graphical User Interface.) Thus, we will have to use the Command Prompt when working with Net Command (net.exe).

Follow these steps to start Command Prompt:

  1. Open the Start Menu
  2. Choose Run
  3. Type “cmd” in Run dialog box
  4. Click OK button

Listing Current Shares

After running the Command Prompt, you can type this command to list the current system shares:

net share

The previous command should display something like that:

Share name   Resource                        Remark

d$           d:                             Default share
e$           e:                             Default share
f$           f:                             Default share
IPC$                                         Remote IPC
print$       C:Windowssystem32spooldrivers
                                             Printer Drivers
C$           C:                             Default share
Programs     D:Programs
The command completed successfully.

The display is divided into three columns, Share Name, Resource, and Remark. Share Name displays the name of the share that is visible to the user. Every share has a unique name and you can control a share only using that name. Resource column shows the path of the share. Remark shows some comments -which you can set manually- about the share.

The previous results from my machine show that all my drives, C, D, E, and F, are currently shared as hidden. They are named, c$, d$, e$, and f$ respectively. That’s the default naming convention used by Windows for hidden disk shares. In addition, the results show that I have shared the D:Programs directory.

Sharing a Resource

To share a new resource (e.g. directory,) you can use the following line:

net share =

Replace with the name of the new share and with the resource path. Again, share name should be unique or the operation would fail.

The following line shares the D:Products directory as the name Products (you may change the path to any other path exist in your machine):

net share Products=D:Products

Now, D:Products is shared successfully. Notice that it’s a normal share, not hidden.

Consider the following line:

net share "Hot Songs"="D:My Songs" /REMARK:"My Favorite Songs"

The previous line shares “D:My Songs” as the name “Hot Songs” (as it would appear in Windows Explorer.) In addition, it sets a remark “My Favorite Songs” that would be shown when you list the shared resources as we did in the previous section.

Note that, you can control share ACLs (Access Control Lists) using switches like /GRANT. See the last section.

Removing a Share

Now, it is the time for removing shares that we don’t need it. The following line removes the hidden share of C drive. Notice that we are referring to the share by its name.

net share C$ /d

The following line is the same:

net share c$ /delete

The following line removes the “Hot Songs” share that we have shared in the previous section:

net share "hot songs" /d

Notice that share name is case-insensitive.

Net Command Help

If you want to discover other features of Net Command or you want to display a command help, just add the /? switch to the end of the command. Consider the following line:

net share /?

It shows the help of the sharing command of the Net Command:

The syntax of this command is:

 sharename=drive:path [/GRANT:user,[READ | CHANGE | FULL]]
                      [/USERS:number | /UNLIMITED]
                      [/CACHE:Manual | Documents| Programs | None ]
 sharename [/USERS:number | /UNLIMITED]
           [/CACHE:Manual | Documents | Programs | None]
 {sharename | devicename | drive:path} /DELETE

Cool, ain’t it?

Welcome to your comments and feedbacks.

Sending Mails in .NET Framework

هذه المقالة متوفرة أيضا باللغة العربية، اقرأها هنا.

فيديو AR002: إرسال رسائل البريد الإلكتروني في ASP.NET

App: Mail+.msi
Code: Mail+ Source-Code.msi


Contents of this article:

  • Overview
  • Introduction
  • Type Overview
    • System.Net.Mail Types
    • System.Web.Mail Types
  • SMTP Servers
  • Implementation
  • Changing Mail Delivery Method
    • Configuring IIS Default Pickup Directory
    • Programmatically Changing Delivery Method
  • A Sample Application
  • Summary


This lesson focuses on how to send mail messages in .NET Framework via a SMTP server. It firstly discusses the techniques which .NET Framework provides you to send mail messages. After that, it discusses types available for you when working with SMTP servers. Next, it discusses how to implement these techniques and to send mails from a .NET client.

At the end of this lesson, there is a sample application, Geming Mail+, which is used to send mails from a various SMTP servers. This application is open-source, so you can download its code freely.


Simple Mail Transport Protocol or simply SMTP provides a way for applications to connect to the mail server and send mail messages via server’s exposed SMTP service.

Before .NET 2.0, you were to access SMTP via classes in System.Web.Mail namespace which resides in System.Web.dll library. With the release of .NET 2.0, System.Web.Mail classes became deprecated and replaced with classes in System.Net.Mail namespace which exists in System.dll library. That means that you still can use classes of System.Web.Mail, however, you will receive warnings indicate that those classes are deprecated and you should use classes from System.Net.Mail namespace.

Type Overview

System.Net.Mail Types

System.Net.Mail namespace includes many types each of which provides a special feature. In fact, the most time you will not need to use all of them or to know them at all. However, being aware of what .NET provides to you for accessing SMTP is better to help you evolving your SMTP client application in many sides and in various degrees. Here are the most common classes of System.Net.Mail:

  • SmtpClient:
    One of the essential classes provides you with means of connecting to the SMTP server and sending mail messages. Before starting using this class and send a message, you must initialize server properties like Host, Port, and EnableSsl to allow communicating with the SMTP server. SmtpClient also provides you with some methods like the Send method that sends a specific message synchronously, and SendAsync to send it asynchronously.
  • MailMessage:
    The message to be sent using the SmtpClient class. This class exposes many properties specific to the message like To, CC, Bcc, Subject, and Body properties that corresponds to the message fields.
  • MailAddress:
    Encapsulates a mail address. Provides the DisplayName and Address properties.
  • MailAddressCollection:
    A collection of MailAddress objects. This collection is used inside the MailMessage object in the properties To, CC, and Bcc.
  • Attachment:
    Encapsulates an attached file.
  • AttachmentCollection:
    A collection of Attachment objects. Used in the MailMessage class in its Attachments property.
  • SmtpException:
    Represents an exception thrown from the SmtpClient if it failed to send a message. Use SmtpException’s StatusCode property to determine the error occurred. In addition, see the inner exception for more details.
  • SmtpFailedRecipientException and SmtpFailedRecipientsException:
    Represent exceptions thrown when the SmtpClient fails to send a message to a specific recipient or a group of recipients. Both classes are derived from SmtpException.
  • SmtpPermission and SmtpPermissionAttribute:
    If you are aware of your code running from various locations or from an unsecure environment, you can use these classes to control how your application should access SMTP servers. You use SmtpPermission to control application permissions imperatively. SmtpPermissionAttribute is used to control the permissions declaratively. Consult MSDN documentation for more information about these types and how to use them.

In addition, System.Net.Mail includes various enumerations each represents a set of options for a specific feature. For example, MailPriority enumeration is exposed via the Priority property of a MailMessage object; it can take one of three values, Low, Normal, and High, and it is used to mark your message with a specific priority flag.

System.Web.Mail Types

Besides types in System.Net.Mail, for whose interested in .NET 1.0 and descendent before .NET 2.0, we will cover types of System.Web.Mail briefly. In fact, they are very few types, actually, they are only three classes and three enumerations, and they serve the same as types in System.Net.Mail.

Classes in System.Web.Mail:

  • SmtpMail:
    Serves the same as System.Net.Mail.SmtpClient. However, it exposes only a single property SmtpServer. Plus, it exposes methods for sending mail messages.
  • MailMessage:
    Encapsulates message related information and data like To, CC, BCC, Subject, and Body fields.
  • MailAttachment:
    Encapsulates an attachment. MailMessage exposes a list of MailAttachment objects via its Attachments property.

Besides those only three classes, System.Web.Mail also includes three enumerations, MailEncoding, MailFormat, and MailPriority. I think that those enumerations have expressive names enough and do not need to be explained. If you need some explanation consult MSDN documentation or continue reading this article. Although, this article concentrates on types from System.Net.Mail, they are very similar to the types in System.Web.Mail.

SMTP Servers

In order to connect to a SMTP server you need to be aware of four things:

  • Server address:
  • Port number:
    Usually 25, and sometimes 465. Depends on server’s configuration.
  • SSL:
    You need to know if the server requires a SSL (Secure Socket Layer) connection or not. To be honest, most servers require SSL connections.
  • Credentials:
    You need to know if the server accepts default credentials of the user or requires specific credentials. Credentials are simply the username and password of the user. All e-mail service providers require specific credentials. For example, to connect to your Gmail’s account and send mails via Gmail’s SMTP server, you will need to provide your mail address and password.

The following is a list of some of the major e-mail service providers who provide SMTP services for their clients:

Name Server Address Port SSL Required?
Live 25 Yes
Gmail 465, 25, or 587 Yes
Yahoo! 465, 25, or 587 Yes
Only for Plus! accounts. Consult Yahoo! documentation for more help about selecting the right port number.
GMX 25 No


The following is a simple code segment uses classes from System.Net.Mail namespace to send mail messages via Gmail’s SMTP server.

Do not forget to add a using statement (Imports in VB.NET) for the System.Net.Mail namespace.

// C# Code

MailMessage msg = new MailMessage();

// Your mail address and display name.
// This what will appear on the From field.
// If you used another credentials to access
// the SMTP server, the mail message would be
// sent from the mail specified in the From
// field on behalf of the real sender.
msg.From = new MailAddress("", "Example");

// To addresses
msg.To.Add(new MailAddress("", "Friend B"));

// You can specify CC and BCC addresses also

// Set to high priority
msg.Priority = MailPriority.High;

msg.Subject = "Hey, a fabulous site!";

// You can specify a plain text or HTML contents
msg.Body =
    "Hello everybody,<br /><br />" +
    "I found an interesting site called " +
    "<a href="">" +
    "Just Like a Magic</a>. Be sure to visit it soon.";
// In order for the mail client to interpret message
// body correctly, we mark the body as HTML
// because we set the body to HTML contents.
msg.IsBodyHtml = true;

// Attaching some data
msg.Attachments.Add(new Attachment("C:\Site.lnk"));

// Connecting to the server and configuring it
SmtpClient client = new SmtpClient();
client.Host = "";
client.Port = 578;
client.EnableSsl = true;
// The server requires user's credentials
// not the default credentials
client.UseDefaultCredentials = false;
// Provide your credentials
client.Credentials =
    new System.Net.NetworkCredential("", "buzzwrd");
client.DeliveryMethod = SmtpDeliveryMethod.Network;

// Use SendAsync to send the message asynchronously
' VB.NET Code

Dim msg As New MailMessage()

' Your mail address and display name.
' This what will appear on the From field.
' If you used another credentials to access
' the SMTP server, the mail message would be
' sent from the mail specified in the From
' field on behalf of the real sender.
msg.From = New MailAddress("", "Example")

' To addresses
msg.To.Add(New MailAddress("", "Friend B"))

' You can specify CC and BCC addresses also

' Set to high priority
msg.Priority = MailPriority.High

msg.Subject = "Hey, a fabulous site!"

' You can specify a plain text or HTML contents
msg.Body = _
    "Hello everybody,<br /><br />" &amp; _
    "I found an interesting site called " &amp; _
    "<a>" &amp; _
    "Just Like a Magic</a>. Be sure to visit it soon."
' In order for the mail client to interpret message
' body correctly, we mark the body as HTML
' because we set the body to HTML contents.
msg.IsBodyHtml = True

' Attaching some data
msg.Attachments.Add(New Attachment("D:Site.lnk"))

' Connecting to the server and configuring it
Dim client As New SmtpClient()
client.Host = ""
client.Port = 578
client.EnableSsl = True
' The server requires user's credentials
' not the default credentials
client.UseDefaultCredentials = True
' Provide your credentials
client.Credentials = _
    New System.Net.NetworkCredential("", "buzzwrd")
client.DelieryMethod = SmtpDeliveryMethod.Network

' Use SendAsync to send the message asynchronously

Changing Mail Delivery Method

You can specify that messages sent do not go to the SMTP server. Instead, it is sent to a directory in your computer that you specify. Actually, it is a good idea when it comes to testing your application. Thus, decreases the testing time.

SmtpClient supports two properties for changing mail delivery location; they are DeliveryMethod and PickupDirectoryLocation properties. DeliveryMethod specifies the delivery method that would be taken when sending the message. This property is of type SmtpDeliveryMethod enumeration; therefore, it can be set to one of three values:

  • Network: (default)
    The message is sent via the network to the SMTP server.
  • PickupDirectoryFromIis:
    The message is copied to the mail default directory of the Internet Information Services (IIS).
  • SpecifiedPickupDirectory:
    The message is copied to the directory specified by the property PickupDirectoryLocation.

Configuring IIS Default Pickup Directory

To change the IIS default pickup directory in IIS 7 follow the following steps:

  1. Start Internet Information Services (IIS) 7 Manager.
  2. From the Home view, select SMTP E-mail item. Figure 1 shows the SMTP E-mail item in the IIS 7 MMC snap-in.

    Figure 1 - Selecting SMTP E-mail Item in IIS 7

    Figure 1 - Selecting SMTP E-mail Item in IIS 7

  3. From the SMTP E-mail configuration view, change the default pickup directory by choosing the option €œStore e-mail in pickup directory€ and selecting your desired directory using the Browse button. Figure 2 shows the SMTP E-mail view while changing pickup directory options.

    Figure 2 - Configuring SMTP E-mail Pickup Directory

    Figure 2 - Configuring SMTP E-mail Pickup Directory

  4. From the right pane, click Apply to save your current settings.

Programmatically Changing Delivery Method

The following lines change the delivery location to a specific location in the drive C. You can add the following lines before the line that calls Send() method of the SmtpClient.

In order for the example to run correctly, the specified directory must be existed or you will receive an exception when executing the Send() method.

    // C# Code
    client.DeliveryMethod =
    client.PickupDirectoryLocation = "C:\mails";
    ' VB.NET Code
    client.DeliveryMethod =
    client.PickupDirectoryLocation = "C:mails"

A Sample Application

Geming Mail+ is an application that is used to send mails via extendable variety of SMTP servers. This application created using .NET 2.0 and Visual Studio 2008. The following are snapshots of the application:

Geming Mail+ Splash Geming Mail+

Download the application here

Download the source code Here


This lesson was a great introduction to e-mail programming in .NET Framework. You learned how to send mails via a SMTP server. Soon we will cover how to receive mails in .NET Framework.

Have a nice day…