How to solve problem: Can't add a reference into console project

Change Target Framework from ".NET Framework 4 Client Profile" to ".NET Framework 4".

HTTP Made Really Easy

http://www.jmarshall.com/easy/http/#whatis

Using HTTP 1.0
What is HTTP?
What are "Resources"?
Structure of HTTP Transactions
Initial Request Line
Initial Response Line (Status Line)
Header Lines
The Message Body
Sample HTTP Exchange
Other HTTP Methods, Like HEAD and POST
The HEAD Method
The POST Method
HTTP Proxies
Being Tolerant of Others
Conclusion

Real-Time Chart using HTML5 Push Notification (SSE) and ASP.NET Web API

http://techbrij.com/1029/real-time-chart-html5-push-sse-asp-net-web-api

Transforming Data Source objects into XML using LINQ

http://www.itorian.com/2012/09/transforming-data-source-objects-into_7545.html

var studentsToXML = new XElement("School",
from student in students
let x = String.Format("{0},{1},{2},{3}", student.Marks[0], student.Marks[1], student.Marks[2], student.Marks[3])
select new XElement("Student",
            new XElement("ID", student.ID),
            new XElement("Name", student.Name),
            new XElement("Address", student.Address),
            new XElement("Marks", x)
        ) //end of "student"
    ); //end of "Root