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Figure 7-19. Application that consumes a typed DataSet The application behaves exactly the same as the one shown in Figure 7-6 earlier, but this time it uses our typed DataSet. Listing 7-19 shows the variable declarations at the form level.

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An exception of type System.Data.SqlClient.SqlException is thrown when SQL Server returns a warning or error. This class is derived from System.SystemException and is sealed so it can t be inherited, but it has several useful members that can be interrogated to obtain valuable information about the exception. An instance of SqlException is thrown whenever the .NET data provider for SQL Server encounters an error or warning from the database. Table 16-1 describes the properties of this class that provide information about the exception. Table 16-1. SqlException Properties

When we refer to commands at the shell, we re actually talking about small programs. When you type a command to list a directory, for example, you re starting a small program that will do that job. Seen in this light, the shell s main function is to simply let you run programs either those that are built into the shell, such as ones that let you manipulate files, or other, more-complicated programs (including those that you ve installed yourself).

Listing 7-19. Declaring a Typed DataSet Variable private string strConn = @"data source=.\sqlexpress; initial catalog=northwind;integrated security=true"; EmployeesDataSet ds = new EmployeesDataSet(); SqlDataAdapter da = new SqlDataAdapter(); SqlConnection cnn; Notice the line marked in bold. The code declares a variable of our typed DataSet, which bears the same name as the DataSet XSD schema file. This typed DataSet is filled in the Load event of the form. The code in the Load event remains the same as before but for the sake of completeness is given in Listing 7-20. Listing 7-20. Filling a Typed DataSet private void Form1_Load(object sender, EventArgs e) { cnn = new SqlConnection(strConn); SqlCommand cmdEmployees = new SqlCommand(); cmdEmployees.CommandText = "SELECT * FROM employees"; cmdEmployees.Connection = cnn; da.SelectCommand = cmdEmployees; da.Fill(ds, "Employees"); FillEmployees(); } The code uses a SqlDataAdapter and calls its Fill() method to populate the typed DataSet. One thing to note here is that the name of the DataTable specified in the Fill() method must match the name of the DataTable that you created in the typed DataSet. Listing 7-21 shows the modified version of the code responsible for inserting, updating, and deleting DataRow objects. Listing 7-21. Inserting, Updating, and Deleting Data from a Typed DataSet private void button2_Click(object sender, EventArgs e) { EmployeesDataSet.EmployeesRow row = ds.Employees.NewEmployeesRow(); row.EmployeeID = int.Parse(comboBox1.Text); row.FirstName = textBox1.Text; row.LastName = textBox2.Text; row.HomePhone = textBox3.Text; row.Notes = textBox4.Text; ds.Employees.AddEmployeesRow(row); FillEmployees(); }

The shell is clever enough to know where your programs are likely to be stored. This information was given to it when you first installed Ubuntu and is stored in a system variable.

Gets the severity level of the error returned from the SqlClient data provider. The severity level is a numeric code that s used to indicate the nature of the error. Levels 1 to 10 are informational errors; 11 to 16 are user-level errors; and 17 to 25 are software or hardware errors. At level 20 or greater, the connection is usually closed. Gets a collection of key-value pairs that contain user-defined information. Specifies the HRESULT of the error. Contains one or more SqlError objects that have detailed information about the exception. This is a collection that can be iterated through. Specifies the help file associated with this exception. Gets the exception instance that caused the current exception. Gets the line number within the Transact-SQL command batch or stored procedure that generated the exception. Defines the text describing the exception. Specifies the number that identifies the type of exception. Specifies the name of the stored procedure that generated the exception.