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In 12, we built an address book application that retrieved static information hard-coded into a switch statement Now we will retrieve that data in real time through a sqlDataReader Open up the AddressBook application from 12, or if you need a clean starter for this exercise, copy the AddressBook folder from the 16 folder on the accompanying CD-ROM The folder must be copied into the root folder of the web server, c:\InetPub\wwwroot Open the project by double-clicking on the AddressBook csproj file in the AddressBook folder If you are prompted to save the AddressBooksln file when you save the project, accept the suggested location and name of the file The modifications that are needed to bind the application to a database are as follows: 1 In the codebehind module (WebForm1aspxcs) delete the entire switch statement from the getName() method The resulting method should look like this: private void getName(char a) { clearList(); } 2 Import the SystemData and SystemDataSqlClient namespaces to the code module 3 Declare an SqlConnection object as a local variable in the getName() method, and name it addrCN 4 Declare a SqlCommand object as a local variable in the getName() method, and name it addrCom 5 Declare a sqlDataReader object as a local variable in the getName() method, and name it addrDR 6 Declare a string, call it strSQL, and make it a local variable in the getName() method Initialize the strSQL string to the connection string for the database: string strSQL = "user id=sa;initial catalog=Address;" + "data source=KENSNABBEN"; 7 Declare a string, call it strCom, and make it a local variable in the getName() method Initialize the strCom string to the following SQL statement: string strCom = "SELECT FirstName, LastName, NameID from Users WHERE LastName LIKE ";

8 Instantiate the connection using the strSQL string 9 Open the connection inside a trycatch finally block 10 Declare a string called strCom1 that is the concatenation of strCom and the character that is the parameter to the method: strCom1 = strCom + "'" + a + "%'" The purpose is to create an SQL string that is delimited by single quotes and has the SQL wildcard character (%) 11 Instantiate the addrCom object using the strCom1 string and the addrCN connection 12 Create the sqlDataReader by calling the ExecuteReader() method of the addrCom object 13 Create a while loop that evaluates the addrDRRead() method to get the next row of data 14 In the loop, use the Add() method of the ListItems collection of the lstAddress ListBox control to insert a ListItem that concatenates the FirstName and LastName of the data row Use the NameID as the value of the ListItem: new ListItem(addrDRGetString(0)+ " " + addrDRGetString(1), addrDRGetInt32(2)ToString()) 15 Close all the objects in the finally block The code for the getName() method should look like the following

73 Name three types of alarms that are received in the control room A Fire, Burglar, and Auxiliary B Fire, Panic, and Theft C Censor, Fire, and Theft D Auxiliary, Fire, and Panic

private void getName(char a) { clearList(); SqlConnection addrCN; SqlCommand addrCom; SqlDataReader addrDR; string strSQL = "user id=sa;initial catalog=Address;" + "data source=KENSNABBEN"; string strCom = "SELECT FirstName, LastName, NameID from Users WHERE LastName LIKE "; addrCN = new SqlConnection(strSQL); try { addrCNOpen(); string strCom1 = strCom + "'" + a + "%'"; addrCom = new SqlCommand(strCom1, addrCN); addrDR = addrComExecuteReader(); // The data population commands will go here while (addrDRRead())

The object referred to by the reference variable w has its own copy of size, color, and capacity If we were to create a new wheel (Wheel w1 = new Wheel();), it would also have its own copy of size, color, and capacity Suppose, though, that you have to keep some data about a wheel that is universal and constant for every wheel created It would be a waste of space and time to create this information for every instance of a wheel Instead we would declare the property with the modifier static in order to tell the compiler that the data belongs to the class and not to the object In order to access class data, you use the class name and not the reference variable Consider our class file Converter Instead of using the number 32 in the code, we could create static data that represents the number This is similar to creating global constants in other programming languages In the Converter class, we would add a line in the variable declarations that states:

static public int difference = 32;

What device is used by the dispatcher when playing back or clarifying a call A Digital audio recorder B Video recorder C Tape recorder D CD player