Facebook external login using oauth returns null email

Need to install Facebook SDK from NuGet packages.
In StartUp File

app.UseFacebookAuthentication(new FacebookAuthenticationOptions { AppId = "XXXXXXXXXX", AppSecret = "XXXXXXXXXX", Scope = { "email" }, Provider = new FacebookAuthenticationProvider { OnAuthenticated = context => { context.Identity.AddClaim(new System.Security.Claims.Claim("FacebookAccessToken", context.AccessToken)); return Task.FromResult(true); } } });

In Controller or Helper

var identity = AuthenticationManager.GetExternalIdentity(DefaultAuthenticationTypes.ExternalCookie); var accessToken = identity.FindFirstValue("FacebookAccessToken"); var fb = new FacebookClient(accessToken); dynamic myInfo = fb.Get("/me?fields=email,first_name,last_name,gender"); // specify the email field

Sorce: Facebook external login using oauth returns null email

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Twitter external login using oauth returns null email

For getting twitter user email using oauth external login we need to getting the Twitter support to allow the permission on our app. Please refer this link : Get user’s email address from twitter OAuth API in .Net applications

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ViewData, ViewBag, TempData in MVC

In MVC there are three ways - ViewData, ViewBag and TempData to pass data from controller to view.

ViewData

•  ViewData is a dictionary object that is derived from ViewDataDictionary class. public 
•  ViewData is used to pass data from controller to corresponding view.
•  Its life lies only during the current request.
•  If redirection occurs then its value becomes null.
•  It’s required typecasting for getting data and check for null values to avoid error.

ViewBag

•  ViewBag is a dynamic property that takes advantage of the new dynamic features in C# 4.0.
•  Basically it is a wrapper around the ViewData and also used to pass data from controller to corresponding view.
• Its life also lies only during the current request.
• If redirection occurs then its value becomes null.

TempData

• TempData is a dictionary object that is derived from TempDataDictionary class and stored in short lives session.
• TempData is used to pass data from current request to subsequent request (means redirecting from one page to another).
• Its life is very short and lies only till the target view is fully loaded.
• It’s required typecasting for getting data and check for null values to avoid error.
• It’s used to store only one time messages like error messages, validation messages.

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How to use wcf service in MVC 5.

In this article, I m explain How to use wcf service in MVC 5.

In previous post I explained How to Create WCF Service in Visual Studio 2013.

Now Continue with previous post.

Create new project, Right Click on Solution Explorer and add new project.

Select ASP>NET Web Application with .NET Framework 4.5.

Select Empty MVC Template.

Your MVC project add in solution explorer.

Now first copy wcf service url.(Please first check previous post here)

Now EmployeeService service references add in your WebApplication.

Now right click on Employee service and Click on Configure Service Reference. 

Now uncheck Reuse type in referenced assemblies and click ok.

Add New Controller in MVC application.

Now add following code in Index action.

Right click on Action method and Add View.

Now Select Template List and Model class.

Your View code look like this.

Now Run Application(Ctrl + F5).

Enjoy..!

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Areas in MVC 5

In this article, I am explain how to use area in MVC.

When we create new MVC project then Model, View and  Controller folder create automatically.

This structure is comman for simple application. but when your application gets big and complex then single model, view and controller can get complicated.So we can maintained complex mvc application using area.Using areas, we can write more maintainable code for 
an application cleanly separated according to the modules.

SO First create new mvc empty project.

Then Right clcik on solution explorer and click on add and select area.

Give Name.

now add second Employee area. In your solution explorer show your model, view and controller in diffrent student and employee area.

Now add Home Controller and in Index action add Index View for both student and employee area.

Now Run Project.(ctrl+F5).

For Teacher area follwing url localhost/Teachers/Home/Index
Hear Teachers is area name, Home is controller and Index is Action name.

For Teacher area follwing url localhost/Students/Home/Index
Hear Students is area name, Home is controller and Index is Action name.

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Download Webgrid data in a pdf file with MVC5

INTRODUCTION

In this article, I am explain How to Download Webgrid data in a pdf file.

In previous post I explained display data In webgrid and delete multiple rows by using checkboxes. Now i will explain how to download that data in a pdf file.

So first check previous post and add Action Link in list.cshtml for Create pdf.

 Create PDF : @Html.ActionLink("Create PDF", "CreatePdf", "Home")

Go to Solution Explorer > Right Click on References > Manage NuGet Packages...> Search with itextsharp text > Install this 2 dll

Now Add CreatePdf Action into Home Controller and also add following namespace.

using iTextSharp.text;

using iTextSharp.text.pdf;

using System.IO;

using System.Web.Helpers;

Now Add CreatePdf Action code .

public FileStreamResult CreatePdf()

        {

            List all = new List();          

            all = db.Employees.ToList();            

            WebGrid grid = new WebGrid(source: all, canPage: false, canSort: false);

            string gridHtml = grid.GetHtml(

                    columns: grid.Columns(

                           grid.Column("Id", "EmployeeId"),

                           grid.Column("Name", "Employee Name"),

                           grid.Column("City", "City"),

                           grid.Column("MobileNo", "Mobile No")

                        )

                    ).ToString();

            string exportData = String.Format("{0}{1}", "", gridHtml);

            var bytes = System.Text.Encoding.UTF8.GetBytes(exportData);

            using (var input = new MemoryStream(bytes))

            {

                var output = new MemoryStream();

                var document = new iTextSharp.text.Document(PageSize.A4, 50, 50, 50, 50);

                var writer = PdfWriter.GetInstance(document, output);

                writer.CloseStream = false;

                document.Open();

                var xmlWorker = iTextSharp.tool.xml.XMLWorkerHelper.GetInstance();

                xmlWorker.ParseXHtml(writer, document, input, System.Text.Encoding.UTF8);

                document.Close();

                output.Position = 0;

                return new FileStreamResult(output, "application/pdf");

            }

        }

RUN APPLICATION(CTTL + F5).

Click on Create PDF. and get PDF.

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Display Data In Webgrid And Delete Multiple Rows By Using Checkboxes In MVC 5 Application

INTRODUCTION

In this article, I am explain How to Display Data In Webgrid And Delete Multiple Rows By Using Checkboxes In MVC 5 Application.

CREATE NEW PROJECT.

Go to File > New > Project > Select asp.net web application (with .NET Framework 4.5) > Enter Application Name > Click OK > Select Empty MVC Template > OK

Create Table.

Add Entity data model.

In previous articles I explained how to add entity data model. here

ADD A NEW CONTROLLER.

Go to Solution Explorer > Right Click on Controllers folder form Solution Explorer > Add > MVC5 Controller- Empty > Enter Controller name Home > Add.

ADD NEW ACTION INTO YOUR CONTROLLER FOR DISPLAY DATA IN WEBGRID.

Here I have added "List" Action into "Home" Controller. write this following code. 

ADD VIEW FOR for the LIST ACTION

Right Click on Action Method (here right click on form action) > Add View... 

Rebuild solution before add view.

Write following code into List view.

ADD ANOTHER ACTION INTO YOUR CONTROLLER FOR DELETE MULTIPLE ROWS AT ONCE.

Here I have added "Delete" Action into "Home" Controller. 

write this following code .

RUN APPLICATION(CTTL + F5).

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Dropdownlist control in MVC using HTML helpers

A dropdownlist in MVC is a collection of SelectListitem objects. Depending on your project requirement you may either hard code the values in code or retrieve them from a database table.

First here we show dropdownlist using hard coded value.

Write following code to your view.

Now run application.(ctrl + F5).

Now write code in Index action for retrieve data from database.

Right click on Index action and Add View and write following code.

Now run application.(ctrl + F5).

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Insert, Update, Delete data in MVC5 using EntityFramework

This tutorial will show you how you can perform insert, update, delete operation in an mvc application using entity framework. This is called CRUD functionality. This you can use in MVC3, MVC4, MVC5.

Here we use entity framework 6 with MVC5.

First of here is our sql table:

So for this tutorial first we will create a new empty mvc application in this we will add a ADO.NET entity data model in Model.

Select EF Designer from database.

Then select Server name and Database name.

Select Yes radio button and click on Next.

Select Entity Framework 6.x.

Then Select table.

Now MVCdb.edmx add in Model folder.

Now Add Employee Controller.

Choose MVC5 Controller with views, using Entity Framework.

Select Model class and DataContextClass and give Controller name Employee.

so now, automatically create  Index,Create,Delete,Edit,Details Views and Controller actions.

Now Run Application. (ctrl+F5)

Clcik on Create New.

Add data and Click on Create button.

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Views in MVC Application

A view requests information from the model that it uses to generate an output representation to the user.

First Add Home Controller in MVC Project.

ViewBag & ViewData is a mechanism to pass data from controller to view.

To pass data from controller to a view, it's always a good practice to use strongly typed view models.

We use "@" symbol to switch between html and C# code.

Enter View Name. and Click Add Button.

Now Create Index.cshtml file in View/Home Folder.

Write Following code into Home Controller.

Now open Index.cshtml file. and write  following code.

Now Run Project.(Ctrl+F5)

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