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Figure 8.115. The nished Add Web Reference dialog box. in .NET Printing pdf417 in .NET Figure 8.115. The nished Add Web Reference dialog box.




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Figure 8.115. The nished Add Web Reference dialog box. generate, create barcode pdf417 none on .net projects Office Excel 8.7 Build Web-Based Web Service Clients to Consume the Web Services Click the Add Reference but ton to nish this Web reference adding process. Immediately you will nd that the following three les have been created in the Solution Explorer window under the folder App WebReferences: WebServiceSQLUpdateDelete.disco WebServiceSQLUpdateDelete.

discomap WebServiceSQLUpdateDelete.wsdl The modi cations to the Web page of the Course.aspx include the following steps.

First, because we develop only one method to update and delete data in our Web Service project, we do not need the Method combo box control in this application. We can remove this control from the graphical user interface; however, it does not matter if we keep it without using it in our Web client project. The second modi cation to this page window is to change the name and the title of the Insert button since no data insertion will be performed in this application.

Perform the following modi cations to this button: 1. Name property: 2. Text property: cmdDelete Delete.

Also change the order of th .net vs 2010 pdf417 2d barcode e Update and the Delete buttons, that is, move the Delete button right and locate it after the Update button. One can use the Ctrl key to select these four buttons and align them either horizontally or vertically with the help of the Format menu item.

Our nished graphical user interface is shown in Figure 8.116. Go to the File.

Save All menu item to save these modi cations. Now let s take care of modi cations to the code in related event procedures and subroutines in the Course.aspx page.

. Figure 8.116. The modi ed graphical user interface. ASP.NET Web Services Figure 8.117. The modi ed Page Load event procedure. 8.7.3 Modify the Code for the Related Event Procedures and Subroutines The rst modi cation is to pdf417 for .NET change the code in the Page Load event procedure and some global variables..

8.7.3.

1 Modify the Code for the Page Load Event Procedure Perform the following changes to complete this modi cation:. 1. Remove the form level va visual .net pdf417 riables dsFlag and wsDataSet.

2. Change the name of the base class for the form level instance wsSQLResult from WS SQLInsert.SQLInsertBase to WS SQLUpdateDelete.

SQLBase. 3. In the Page Load event procedure, remove the code that is used to add and display the second Web method, DataSet Method, in the combo box control.

Your modi ed code for the Page Load event procedure should match that shown in Figure 8.117. The modi cations are highlighted in bold.

The next step is to develop the code for the Update button s click event procedure.. 8.7.3.

2 Develop Code for th e Update Button Event Procedure The functionality of this event procedure is that when a faculty name is selected and all six pieces of updated course information are ready in the six text box controls, the updated course information will be passed to the Web method SQLUpdateSP() we developed in our Web Service project, and the stored procedure WebUpdateCourseSP() is executed to perform this course updating action when the Update button is clicked by the user. Now let s double-click the Update button to open its click event procedure, and enter the code shown in Figure 8.118 into this event procedure.

. 8.7 Build Web-Based Web Service Clients to Consume the Web Services Figure 8.118. The code for the Update button click event procedure. Let s take a closer look at .net framework PDF417 this piece of code to see how it works. A.

A new instance of our Web proxy class, wsSQLUpdate, is created, and this instance is used to access the Web method SQLUpdateSP() we developed in our Web Service class WebServiceSQLUpdateDelete. B. A local string variable, errMsg, is also created, and it is used to reserve the error source that will be displayed as a part of an error message later.

C. A Try . .

. Catch block is used to call the Web method SQLUpdateSP() with six pieces of updated course information to execute the stored procedure WebUpdateCourseSP() to perform this course update in our sample database. D.

An error message will be displayed if an error is encountered during that data updating action. A point to note is the display format of this error message. To display a string variable in a message box in the client side, one must use the Javascript function alert() with the input string variable as an argument that is enclosed and represented by + input string + .

E. Besides the system error-checking methods, we also need to check the member data SQLOK that is de ned in our base class in the Web Service project to make sure that this data updating is application-error free. A returned False value of this member data indicates that this data update encountered some application error, and the error source stored in the member data SQLError is displayed using the Java script function alert().

In a similar way, we can develop the code for the Delete button s click event procedure to perform data deletion in our sample database.. 8.7.3.

3 Develop Code for th e Delete Button s Click Event Procedure The functionality of this event procedure is that when a course id has been selected either from the list box control or from the Course ID text box control in this client page window, the selected course with a primary key that equals that course id will.
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