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If you install SQL Server Express as a named instance on a computer with a default instance of MSDE (or some other SQL Server 2000 edition), (local) or localhost will refer to the MSDE or SQL Server 2000 default instance. Then you can refer to the SQL Server Express instance as .\sqlexpress.
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After you create an instance of a SqlConnection object, you will often need to explicitly open it before you can use it. Invoke the Open method of the SqlConnection class instance to make the object available for use with a SqlCommand object. If you do explicitly open a SqlConnection object, then you should explicitly close the object before exiting the procedure. Two programming practices that can help reduce the load on a database instance are as follows: 1. Open an ADO.NET Connection object just before you need it. 2. Close the Connection object immediately after completing your need for it.
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You do not need to open a SqlConnection object when you use it with a SqlDataAdapter object. This is Tip because the SqlDataAdapter manages the status of its associated SqlConnection object. Other SqlClient objects, such as SqlCommand or SqlDataReader, do not manage the status of an associated SqlConnection object.
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Dim cnn1 As SqlConnection = _ New SqlConnection("Data Source=(local);" & _ "Integrated Security=True;" & _ "Initial Catalog=northwind")
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CHAPTER 11 PROGRAMMING ADO.NET
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'Open connection cnn1.Open() MessageBox.Show("Connection succeeded.") 'Place code to use connection here 'Close connection cnn1.Close() MessageBox.Show("Connection closed.")
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Getting Help with Constructing a Connection String
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It is very easy to forget the connection string for pointing a SqlConnection object at a SQL Server database. The ease of forgetting is multiplied when you need to use integrated security in some cases and SQL Server security in other cases. Therefore, it is useful to know how to get help with constructing a connection string.
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Recall that with integrated security, SQL Server trusts the Windows verification of the identity of a user. In the case of SQL Server security, SQL Server manages the identity of a user.
When you connect to a SQL Server instance with SQL Server security, you need a different connection string than with integrated security. In particular, you can replace the assignment for integrated security with assignments for UserID and Password. Recall that Figure 11-1 shows Form1 with two text boxes for the input of UserID and Password values. Whenever you accept input for a SQL Server database server, you expose an application to potential attack by SQL injection. In this kind of attack, a hacker can inject some illegitimate SQL instructions into a connection string in an attempt to gain entry to a SQL Server instance. The extra input overloads a valid connection string specification. The SqlConnectionStringBuilder class can both help you to remember valid SQL Server connection string conventions and substantially reduce the possibility of a hacker attack by SQL injection. In this way, a SqlConnectionStringBuilder class instance delivers benefits at both design time and runtime. In addition, you can pass a SqlConnectionStringBuilder object a previously saved connection string, and then modify the connection string through the SqlConnectionStringBuilder object. The SqlConnectionStringBuilder class knows all the valid key/value pairs for a connection string argument. Therefore, a hacker attack that relies on entering invalid key/value pairs will automatically be rejected at runtime as invalid. If a hacker overloads either the user name or password with invalid input, the SqlConnectionStringBuilder object used to construct the full connection string will detect the extra input as invalid. By detecting overloaded values as invalid, a SqlConnectionStringBuilder object can defeat a hacker attack. The following code from the Button2_Click procedure for Form1 illustrates the use of the SqlConnectionStringBuilder class for constructing the connection string for a SqlConnection object. This connection string uses SQL Server security instead of integrated security syntax and a Try...Catch...Finally clause for managing the SqlConnection object. This approach is superior to the preceding example in that it guards against a runtime error that causes your application to lose control of the computer, and it can automatically close a SqlConnection object after it is no longer needed. The code segment starts by declaring cbd1 as a SqlConnectionStringBuilder object and cnn1 as a SqlConnection object. Notice the variable for the SqlConnectionStringBuilder object exposes members, such as Data Source, for assigning values to key/value pairs in a connection string. The .\sqlexpress assignment to the Data Source member assigns a named SQL Server
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