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In the first catch clause, you specify a database exception type. The second catch clause, which produces the message box in Figure 13-3, is a generic block that catches all types of exceptions. Note the caption of the message box in this catch block. It says Non-Database Exception. Although you may think that a failure to specify a command string is a database exception, it s actually an ADO.NET exception; in other words, this error is trapped before it gets to the database server. When the button is clicked, since the CommandText property isn t specified, an exception is thrown and caught by the second catch clause. Even though a catch clause for SqlException is provided, the exception is a System.InvalidOperationException a common exception thrown by the CLR, not a database exception. The exception message indicates where the problem occurred: in the ExecuteReader method. The finally block checks if the connection is open and, if it is, closes it and gives a message to that effect. Note that in handling the exception, you don t terminate the application:

The compiler would take care of allocating some memory to store the value returned from average() It would also take the trouble to make a copy of this to hand over to the function printf() as an argument Once the printf() had been executed, however, you would have had no means of accessing the value that was returned from the function average() Another possible option is to use explicit values in a function call What happens then Let s stretch the printf() statement out of context now and rewrite it like this: printf("\nThe average is: %f", average(40, 60)); In this case if the literal 40 and 60 don't already exist, the compiler would typically create a memory location to store each of the constant arguments to average(), and then supply copies of those values to the function exactly as before.

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A copy of the result returned from the function average() would then be passed to printf() Figure 8-5 illustrates the process of calling a function named useful() from main() and getting a value returned..

finally { if (conn.State == ConnectionState.Open) { MessageBox.Show ("Finally block closing the connection", "Finally"); conn.Close(); } }

The concept behind an ssh-agent is that you store your identity (authentication information) at the beginning of a session, and then when remote connections are being established, they consult the agent behind the scenes. The program ssh-agent sets up a socket that stores authentication information normally in /tmp, and sets up some environment variables to make the ssh client and shell aware of the socket s existence. The normal output from running ssh-agent is a few environmental variables. Just displaying their values provides little value. To properly invoke the ssh-agent, the ssh-agent output should be captured and directed to the shell, as in this example: stahnke@rack:~> eval `ssh-agent` Agent pid 19254 To see which environment variables are set, you can use a set command. stahnke@rack: ~> set | grep SSH SSH_AGENT_PID=19254 SSH_AUTH_SOCK=/tmp/ssh-sJnvL19253/agent.19253 The SSH_AGENT_PID variable is the process ID of the running agent. The ssh-agent will run until explicitly killed (ssh-agent -k), which is often done by the shell at logout. The SSH_AUTH_SOCK is the socket created with the authentication information. This file is normally only readable by the owner of the ssh-agent process.

The name that you give to a variable, conveniently referred to as a variable name, can be defined with some flexibility. A variable name is a sequence of one or more uppercase or lowercase letters, digits, and underscore characters (_) that begins with a letter (incidentally, the underscore character counts as a letter). Examples of legal variable names are as follows:

Try It Out: Handling an ADO.NET Exception (Part 2)

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