In this article, I demonstrate how to create a ASP.NET 4.5.2 Web Service. We will start off with a simple ASP.NET 4.5.2 Web service and then look at how to retrieve values from the database.
What is Web Service?
A Web Service is a reusable piece of code used to communicate among Heterogeneous Applications.
Once a web service is created and hosted on the server in the internet it can be consumed by any kind of application developed in any technology.
1. Create a database table by name
doctormaster(DoctorID,Doctor_Name,Specialist,Gender,Phone as columns) in MSSQL
Server database with some data.
Open Microsoft Visual Studio 2008--> File --> New --> Web Site --> Select ASP.NET Web Service --> Choose Language to "Visual c#"
2. In the Service.cs File, Copy paste the code below:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX,
Uncomment the following code:
// [System.Web.Script.Services.ScriptService]
public class Service : System.Web.Services.WebService
{
SqlConnection con = new SqlConnection("Data
Source=HostForLIFE\\SQLEXPRESS2012;Initial Catalog=hospital1;Integrated
Security=True");
SqlCommand cmd = new SqlCommand();
SqlDataReader dr;
public Service () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public string HelloWorld() {
return "Hello World";
}
[WebMethod]
public List<Doctor> getDoctorDetails()
{
var doclist = new List<Doctor>();
Doctor doc;
con.Open();
cmd.Connection = con;
cmd.CommandText = "SELECT * from doctormaster";
dr = cmd.ExecuteReader();
while (dr.Read())
{
doc = new Doctor
{
DoctorID = dr["DoctorID"].ToString(),
Doctor_Name = dr["Doctor_Name"].ToString(),
Specialist = dr["Specialist"].ToString(),
Gender = dr["Gender"].ToString(),
Phone = dr["Phone"].ToString()
};
doclist.Add(doc);
}
return doclist;
}
}
public class Doctor
{
public string DoctorID = string.Empty;
public string Doctor_Name = string.Empty;
public string Specialist = string.Empty;
public string Gender = string.Empty;
public string Phone = string.Empty;
}
Finally, You can run the program and click the "getDoctorDetails" Web
On Method link in the browser --> press invoke. The Output will be in XML Format. Now you can use this web service in any front end applications.
[Note: Make Your Own Connection String Instead Of "Data
Source= HostForLIFE\\SQLEXPRESS2012;Initial Catalog=hospital1;Integrated
Security=True"]
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