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Entity Framework with ASP.NET MVC

, 16 Aug 2009 CPOL
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In this article, I will explore the entity framework with ASP.NET MVC. We will modify the form validation sample that will access the data layer using the Entity Framework.

Introduction

In this article, I will explore the Entity Framework with ASP.NET MVC. We will modify the form validation sample that will access the data layer using the Entity Framework.

We will create the following table in a local database using SQL Express:

CREATE TABLE [dbo].[tblComment]( 
    [CommentID] [int] IDENTITY(1,1) NOT NULL, 
    [Name] [nvarchar](50) NULL, 
    [Email] [nvarchar](100) NULL, 
    [Comment] [nvarchar](100) NULL)

Now, right click on the Models directory and select Add New Item. In the dialog, select ADO.NET Entity Data Model, as shown below:

In the wizard, select "Generate from Database", and then select your database connection string. Then, select the tblComment table and the click Finish. Visual Studio will create a set of .NET classes that are custom built for accessing the database, as shown below:

Now, we will modify our controller as shown below:

[HandleError] 
public class UserCommentController : Controller 
{ 
    [AcceptVerbs("GET")] 
    public ActionResult UserComment() 
    { 
        return View(); 
    } 
    [AcceptVerbs("POST")] 
    public ActionResult UserComment(string name, string email, string comment) 
    { 
        ViewData["name"] = name; 
        ViewData["email"] = email; 
        ViewData["comment"] = comment; 
        if (string.IsNullOrEmpty(name)) 
            ModelState.AddModelError("name", "Please enter your name!"); 
        if (!string.IsNullOrEmpty(email) && !email.Contains("@")) 
            ModelState.AddModelError("email", "Please enter a valid e-mail!"); 
        if (string.IsNullOrEmpty(comment)) 
            ModelState.AddModelError("comment", "Please enter a comment!"); 
        if (ViewData.ModelState.IsValid) 
        { 
            // Add to database 
            try 
            { 
                CommentEntities _db = new CommentEntities (); 
                tblComment commentToCreate = new tblComment(); 
                commentToCreate.Name = name; 
                commentToCreate.Email = email; 
                commentToCreate.comment= comment; 
                _db.AddTotblComment(commentToCreate); 
                _db.SaveChanges(); 
            } 
            catch 
            { 
                return View(); 
            } 
        } 
        return View(); 
    } 
}

Summary

In this article, we explored the Entity Framework with ASP.NET MVC. In the next article, I will explore a custom IErrorDataInfo interface.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Farooq Kaiser
Software Developer (Senior) http://www.Fairnet.com
Canada Canada
12+ years of complete software development life cycle experience for web based applications and multi-tier client-server desktop, primarily using LINQ, WCF, WWF, C#, ASP.NET, XML, XSLT, AJAX, Winforms,Visual Basic, JavaScript, JQuery, Google APIs, C++, VB.NET, C, ATL/COM, Open XML. Extensively involved in the requirement analysis, feasibility study, conceptualization, planning, architecture/design, configuration, development, quality assurance, implementation and release of the software products.

Comments and Discussions

 
Generalhttp://www.codeproject.com/KB/aspnet/ASP_NET_MVC_WITH_EF.aspx PinmemberNirosh22-Jul-10 19:13 
GeneralMy vote of 1 PinmemberShawn Camp17-Aug-09 5:03 
GeneralMy vote of 1 PinmemberHenry Minute17-Aug-09 1:17 

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