Creating and Consuming Your First ASP.NET Web Services

Creating Your First Web Service Using Asp.net with visual studio 2010

• Start visual studio 2010
• Start a new website.
• Select Asp.net web service in the new website dialog box and click OK.

• In the service.cs file type a web method as follows
• Helloworld web method is automatically generated (no:1 in image)
• Here I have added a new web method called "Add" which takes two parameters(no:2 in image)

[WebMethod]

public string HelloWorld() {

return "Hello World";

}

[WebMethod]

public int Add(int a, int b)

{

return a + b;

}

• Then run the web service. you will see the list of operations supplied by the service
• no:1 shows the helloworld method and no:2 shows our mehod "Add" and no:3 shows the link to service discription of the web service

• When you click no:1 and no:2 as shown above you will get the web methods respectively

• Then we can click invoke button to check the web method. If there are any required field must be filled-these fields are the parameters of web method.
• After clicking invoke button we get the xml result of our service if service is works properly as follows.
• For Helloworld web method;

• For Add web method

• Now you are done with asp.net web service creation

Consuming Your First Web Service Using Asp.net with visual studio 2010

• Start another visual studio 2010 instance.
• Create a new web application.

• Then create the GUI in the design of default.aspx file

• Then double click the Add Numbers or go to the button click event of Add Numbers button
• Then run your first web service and copy the url of web service.

• Then right click on solution name in solution explorer.
• Select Add Web Reference

• Then paste the url in the url box of the Add Web Reference dialog box and hit enter key.
• Then click the web method you want from the list appear

• Then click the Add Reference Button

• Then you will see the localhost web reference is added
• Then rename the local host to one you like-I use "MyService"

• Then add the name space to default.aspx.cs
• Type the following code in the button click event method

int a=Convert.ToInt32(TextBox1.Text);

int b=Convert.ToInt32(TextBox2.Text);

MyService.Service s = new Service();

int ans=s.Add(a, b);

Label1.Text = "The Sum is :" + ans;

• In image

1-get the values from the text boxes and convert to int

2-create an instance of the service class of web service

3-call the web service-web method with parameter passing

4-attach result to the lable

• Then run your web application
• You will get a interface similar to this

• Give input values and click Add Numbers button
• It will send to the web service and web service will return the sum
• Then your application will show the result.
• Now you are consuming your own web service

Coool...

Try this and then Check what happens behind the scene-Good Luck.