1. CS 3870/CS 5870
Web Service

2. Web Service What is Web Service?
Providing functionality online to other applications, Web and Windows applications.
The original Goal of MS ASP.NET
To enable developers to build and consume Web services with easy

3. Communication Between Disparate Systems
Systems within an organization
Unix
Windows
Mac
Others
Various systems need to talk with one another
Not an easy job

4. SOAP and XML XML: eXtensible Makeup Language SOAP
Simpler version of SGML
(Standard Generalized Makeup Language)
Best choice for disparate systems for now
SOAP
Simple Object Access Protocol

5. Previous Attempts DCOM Distributed Component Object Model RMI
Remote Method Invocation
CORBA: . . .
IIOP: . . .
Driven by a single vendor or
Very vendor specific

6. Creating Web Service Add New Items Web Service
Specify Name: UWPCSSEWebService2016
File UWPCSSEWebService2016.asmx
File UWPCSSEWebService2016.vb
under App_Code

7. WebService Page Directive
File UWPCSSEWebService2016.asmx
WebService Language="VB"
CodeBehind="~/App_Code/ UWPCSSEWebService2016.vb"
Class="WebService" %>

8. Web Service Class (VB File)
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
‘ To allow this Web Service to be called from script,
‘ using ASP.NET AJAX, uncomment the following line.
‘ <System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:=" _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class WebService
Inherits System.Web.Services.WebService
. . .
End Class

9. Web Service Class ScriptService: AJAX Service.Protocols
Web Service Namespace
Default :
Change to:
ScriptService: AJAX
Service.Protocols
SOAP can be used in VB.NET

10. Web Service Class Public Class UWPCSSEWebService2016
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Function HelloWorld() As String
Return "Hello, World"
End Function
Public Function WS_GetAllProducts() As Data.DataTable
. . .
‘ Return a datatable
End Class

11. Web Service Class Public Class UWPCSSEWebService2016
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Function WS_GetAllProducts() As Data.DataTable
Public Sub WS_UpdateProduct(. . .
Public Sub WS_InsertProduct(. . .
Public Sub WS_DeleteProduct(. . .
End Class
Must have <WebMethod()>
Can call methods of SQLDataClass
Make sure method setupAdapter is called
Prog3

12. Looking at Web Service

13. SOAP
SOAP Envelop
SOAP Body

14. Consuming Web Service Adding Web Reference
Invoking Web Service from client application

15. Adding Web Reference Right click the root of the Web Site
Add Service Reference
Enter the URL of the wanted web service followed by “?WSDL”
Namespace
Your choice for your program

16. Required Three Web References
Service Reference to the Web Service created on Web site CS3870
Service Reference to the Web Service created on Web site YangQ
Service Reference to the Web Service created on your Web site

17. The Web Config file will be updated automatically with the following.
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="UWPCSSEWebService2016Soap">
<security mode="Transport" />
</binding>
<binding name="UWPCSSEWebService2016Soap1" />
</basicHttpBinding>
</bindings>
<client>
<endpoint address="
binding="basicHttpBinding" bindingConfiguration="UWPCSSEWebService2016Soap"
contract="CS3870.UWPCSSEWebServiceSoap" name="UWPCSSEWebService2016Soap" />
</client>
</system.serviceModel>

18. Selecting Web Services on Form Default.aspx
Dim ws As String = DropDownList1.Text
Dim obj As Object
If ws = "CS3870" Then
obj = New CS3870.UWPCSSEWebService2016SoapClient
ElseIf ws = “YangQ" Then
obj = New MyWebService.UWPCSSEWebService2016SoapClient
Else
obj = New YourWebService.UWPCSSEWebService2016SoapClient
End If
Session(“Prog9_WS") = obj

19. Display the selected Web Service name
If ws = "CS3870" Then
. . .
obj = New YourWebService.UWPCSSEWebService2016SoapClient
End If
Session(“Prog9_WS") = obj
ws = obj.ToString
Dim c As Control = Master.Master.FindControl("form1")
c = c.FindControl("ContentPlaceHolder1")
c = c.FindControl("Label1")
CType(c, Label).Text = ws
Session("Prog9_WSName") = ws

20. Prog9MasterPage
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<h3>Prog 9: <asp:Label ID="Label1" runat="server" Text=""></asp:Label> </h3>
</asp:Content>
ws = obj.ToString
Dim c As Control = Master.Master.FindControl("form1")
c = c.FindControl("ContentPlaceHolder1")
c = c.FindControl("Label1")
CType(c, Label).Text = ws
Session("Prog9_WSName") = ws

21. Invoking Web Methods on Form AllProducts.aspx
Dim obj As Object
Dim myTable As Data.DataTable
Protected Sub Page_Load(. . .) Handles Me.Load
obj = Session(“Prog9_WS")
myTable = obj.WS_GetAllProducts()
GridView1.DataSource = myTable
GridView1.DataBind()
End Sub

22. Invoking Web Methods on Form Product.aspx
Protected Sub Page_Load(. . . ) Handles Me.Load If Session("Prog9_WS") Is Nothing Then Response.Redirect("~/Prog9/Default.aspx") End If obj = Session(“Prog9_WS") myTable = obj.WS_GetAllProducts() GridView1.DataSource = myTable GridView1.DataBind() End Sub

23. Try and Catch
Protected Sub Button1_Click(. . .) Handles btnUpdate.Click Try obj.WS_UpdateProduct(oldID, txtName.Text, txtPrice.Text, txtDescription.Text) Catch ex As Exception txtMsh.Text = ex.Message End Try End Sub

24. Shopping and Updating
Look into Your Prog3

25. Accessing Database Using Web Service
No Credit if Accessing Database without Web Service

26. Session Variables Need to be Created and Updated
Name starting using “Prog9_”

27. Delete and Create Service Reference?
Not Working
Delete and Create Service Reference?

28. AJAX
All Web Forms except Default.aspx Could have multiple UpdatePanels on one Web form.

29. Bonus Points