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As mentioned in the chapter introduction, Linux (and therefore Ubuntu) is not currently affected by many viruses. Nobody knows the true number of viruses affecting Linux, but it is probably less than 1,000, and that s the total since Linux was created back in the early 1990s! At the time of this writing, there are relatively few Linux viruses in the wild, which is to say, actively infecting computers. However, there can be no room for complacency. It s probable that virus writers will turn their attention to Linux in the coming years as it becomes a popular desktop solution. It s also important to be vigilant because your Ubuntu system may be interacting with Windows computers and may act as a carrier of Windows viruses. This section describes how to use ClamTk, which is a graphical front end for the Clam AntiVirus (ClamAV) program (http://clamtk.sf.net). ClamAV is an open source, industrial-strength antivirus scanner designed to work on all kinds of computers and operating systems. It detects Windows and even Macintosh viruses, as well as Linux and UNIX viruses. This has obvious benefits if you share files with Windows users you can inform your friends and colleagues if any files they give you are infected (and bask in the warm feeling that arises when you realize the viruses can t affect your system!). ClamAV s only drawback is that it is limited to virus scanning. It isn t able to disinfect files, like the more sophisticated virus scanners available for Windows. However, it should be noted that disinfection rarely works very well, as discussed in the ClamAV FAQ (http://clamtk.sf.net).

The NET Framework data providers, sophisticated as they are (and you ll learn plenty about exploiting their sophistication later), are simply APIs for accessing data sources, most often relational databases (ADONET is essentially one big API of which data providers are a major part) Newcomers to ADONET are often understandably confused by the Microsoft documentation They read about Connection, Command, DataReader, and other ADONET objects, but they see no classes named Connection, Command, or DataReader in any of the ADONET namespaces The reason is that data provider classes implement interfaces in the SystemData namespace These interfaces define the data provider methods of the ADONET API The key concept is simple A data provider, such as SystemDataSqlClient, consists of classes whose methods provide a uniform way of accessing a specific kind of data source.

Figure A-1. Adding empty implementations of properties and methods This will add dummy signatures of all the properties and methods that need to be overridden. Notice how the dummy implementation throws an exception by using the throw keyword. This way, if somebody tries to use unimplemented members, an exception will be thrown indicating that the method or operation is not implemented. Code the TableReader class as shown in Listing A-3. Listing A-3. The TableReader Class public class TableReader:XmlReader { private OleDbConnection cnn; private OleDbCommand cmd; private OleDbDataReader reader; private int intColumnIndex = -1; private string strValue; public TableReader(string connectionString,string tableName) { cnn = new OleDbConnection(connectionString); cmd = new OleDbCommand(); cmd.Connection = cnn; cmd.CommandText = tableName; cmd.CommandType = CommandType.TableDirect; cnn.Open(); reader = cmd.ExecuteReader(); }

You can install ClamAV and ClamTk through the Ubuntu Software Center, as follows: 1. 2. 3. Choose System Administration Ubuntu Software Center.

In the Search text box enter clamtk as a search term. In the list of results, locate the program Virus Scanner and click the Install button. Enter your password when prompted.

In this chapter, you used three different data providers (SQL Server, OLE DB, and ODBC) to access the same SSE database The only real difference in the code was the connection string Except for choosing the appropriate data provider, the rest of the programming was effectively the same This is true of all ADONET facilities, whatever kind of data source you need to access The SQL Server data provider is optimized to access SQL Server and can t be used for any other DBMS The OLE DB data provider can access any OLE DB data source and you used it without knowing anything about OLE DB (a major study in itself) The ODBC data provider lets you use an even older data access technology, again without knowing anything about it.

public override int AttributeCount { get { return reader.FieldCount; } } public override void Close() { reader.Close(); cnn.Close(); } public override int Depth { get { return reader.Depth; } } public override string GetAttribute(int i) { return reader.GetValue(i).ToString(); } public override string GetAttribute(string name) { return reader.GetValue(reader.GetOrdinal(name)).ToString(); } public override bool MoveToAttribute(string name) { intColumnIndex = reader.GetOrdinal(name); return true; } public override bool MoveToElement() { intColumnIndex = -1; return true; }

Many additional applications might prove useful on a day-to-day basis. Here we review some of the more common ones.

The GNOME Calculator (also known as Gcalctool) can be found on the Applications Accessories menu. In its default mode, shown in Figure 11-11, it shouldn t present any challenges to anyone who has ever used a real-life calculator.