Monthly Archives: December 2013

Book Review: “Nuget 2 Essentials” from Packt Publisher


In this post, I am going to review a book Nuget 2 Essentials from Packt Publisher.

Review

Recently I have gone through a book “Nuget to Essentials” and as a developer, I have found it to be a concise, interesting and very useful introduction to Nuget. Authors Damir Arh and Dejan Dakic have covered Nuget Package Manager and related topics very brilliantly.

It is so easy to read and the information is very interesting that each time you turn a page,
you want to learn and know more about Nuget! Every topic in this book is covered with examples. You can download the example code files for all Packt books you have purchased from your account. Since All the examples are written in C# language, only basic knowledge of the language is required to start reading this book.

Here is a list of the positive things, I found about the book:

  • Doesn’t require any prior knowledge about NuGet
  • Example source codes are written in C#
  • All the concepts on real-world examples step by step with a section that explain you the whole process each time in every topic
  • Very comprehensive writing. Authors explained almost everything which makes things clear!
  • Very informative, even if you are a beginner, an intermediate or an advanced user
  • Covers all aspects of using NuGet, from the basics to the advanced scenarios of creating packages and hosting an internal server

After you’ve read the book, you know how to easily find and refer third-party libraries from your projects, create packages from your class libraries for others to use and publish them to the official NuGet gallery and host your own internal NuGet server and publish packages to it.

One thing I have noticed about Packt Publisher is that they offer eBook versions of every book published with PDF and ePub files available, which is very great and added advantage.

Since everything is covered related to Nuget Package Manager along with simple and easily understandable examples, I strongly recommended this book to every .NET developer who wants to learn more about NuGet. A must have ‘Essential‘ book.

Book Details

Language : English
Paperback : 116 pages
Release Date : November 2013
ISBN / ISBN 13 : 178216586X / 9781782165866
Author(s) : Damir Arh, Dejan Dakic
Topics and Technologies : All Books, Open Source

Win Free Copies of the new book NuGet 2 Essentials from Packt Publishing


I recently came across a new book NuGet 2 Essentials from Packt Publishing. You would be pleased to know that I have teamed up with Packt Publishing to organize a Giveaway of the book.

And three lucky winners stand a chance to win 3 digital copies of this book. Keep reading to find out how you can be one of the Lucky Winners.

Overview:

  • Install NuGet in all supported versions of Visual Studio
  • Use NuGet with source control and build servers
  • Create a NuGet package for your own class library
  • Publish your package to the official NuGet gallery
  • Create packages with multi-platform and multi-language support
  • Automatically configure target projects from the packages you create
  • Include custom install and uninstall scripts in your packages
  • Support debugging of your packaged libraries
  • Install your own internal NuGet server
  • Configure NuGet to use different NuGet servers

How to Enter?
All you need to do is head on over to the book page and look through the product description of the book and drop a line via the comments below this post to let us know what interests you the most about this book. It’s that simple.

Winners will get an e-copy of the Book.

Deadline
The contest will close on 31st Dec 2013. Winners will be contacted by email, so be sure to use your real email address when you comment!

Tuple in C# 4.0


A Tuple in C# is an ordered sequence, means each object being of a specific type. It is introduced in C# 4.0 with dynamic programming. It can be useful when returning more than one value from a method.

A Tuple has many items. Each item can have any data type. The Tuple class provides a unified syntax for creating objects with typed fields.

Visual studio provides the intellisense for tuple object depends upon the data type of the item.

Methods


//Creates a new 1-tuple, or singleton.
public class Tuple <T1>

//Creates a new 2-tuple, or pair.
public class Tuple <T1, T2>

//Creates a new 3-tuple, or triple.
public class Tuple <T1, T2, T3>

//Creates a new 4-tuple, or quadruple.
public class Tuple <T1, T2, T3, T4>

//Creates a new 5-tuple, or quintuple.
public class Tuple <T1, T2, T3, T4, T5>

//Creates a new 6-tuple, or sextuple.
public class Tuple <T1, T2, T3, T4, T5, T6>

//Creates a new 7-tuple, or septuple.
public class Tuple <T1, T2, T3, T4, T5, T6, T7>

//Creates a new 8-tuple, or octuple.
public class Tuple <T1, T2, T3, T4, T5, T6, T7, T8>

A Tuple can be instantiated in two ways:

1. Constructor


var tuple = new Tuple<int, string>(10, "Hello World");

2. Static method


var tuple = Tuple.Create(10.10, "Hello World", 50);

Tuples are commonly used in four ways:

1. To represent a single set of data. For example, a tuple can represent a database record, and its components can represent individual fields of the record.

2. To provide easy access to, and manipulation of, a data set.

3. To return multiple values from a method without using out parameters.

4. To pass multiple values to a method through a single parameter.

Example


Tuple<int, string> tuple = new Tuple<int, string>(10, "Hello World!");
Console.WriteLine(tuple.Item1); // will print 10
Console.WriteLine(tuple.Item2); // will print "Hello World!"

Realtime Currency Converter in C# ASP.NET using Yahoo API


In this article, Let’s see how to convert worldwide currencies in realtime using Yahoo API.

Steps:

1. Create a ASP.NET empty project, call it as “RealtimeCurrencyConverterUsingYahooAPI”.

2. Add a webpage called “Default.aspx” to the project.

3. Since we are using jQuery, include the jQuery latest library in the project. Add a reference to it on “Default.aspx” page.


<script src="jquery-1.10.2.js"></script>

4. Add the following webmethod in code behind.


using System;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Web.Services;

[WebMethod]
public static Decimal ConvertCurrency(decimal amount, string fromCurrency, string toCurrency)
{
WebClient client = new WebClient();
Stream response = client.OpenRead(string.Format("http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={0}{1}=X", fromCurrency.ToUpper(), toCurrency.ToUpper()));
StreamReader reader = new StreamReader(response);
string yahooResponse = reader.ReadLine();
response.Close();
if (!string.IsNullOrWhiteSpace(yahooResponse))
{
string[] values = Regex.Split(yahooResponse, ",");
if (values.Length > 0)
{
decimal rate = System.Convert.ToDecimal(values[1]);
return rate * amount;
}
}
return 0;
}

The webmethod simple get response from yahoo URL. Parses it and returns the calculated result back on the screen.

5. To call this webmethod from “Default.aspx”, just add the following jQuery Code.


<script type="text/javascript">

$(document).ready(function () {
$('#submit').click(function () {
var errormsg = "";
var amount = $('#txtAmount').val();
var fromCurrency = $('#drpFromCurrency').val();
var toCurrency = $('#drpToCurrency').val();
$.ajax({
type: "POST",
url: "Default.aspx/ConvertCurrency",
data: "{amount:" + amount + ",fromCurrency:'" + fromCurrency + "',toCurrency:'" + toCurrency + "'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (data) {
$('#results').html(amount + ' ' + fromCurrency + ' equals ' + data.d.toFixed(2) + ' ' + toCurrency);
},
error: function (jqXHR, exception) {
$('#results').html(jqXHR.responseText);
}
});
});
});

</script>

If you don’t know how to call a webmethod in jQuery, Please refer this.

6. To style the table, I have just added a stylesheet and referred it in the “Default.aspx” page. You can generate such styles very easily from here.

7. Now run the project and you will find the output like e.g

Source Code Download:

Github [Repository Link]

Box.com [Direct Download Link]