Asp. Net MVC validation Process using Data Annotation

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Presentation Description

Data annotations define the list of attribute classes that can be found in System. Component Model. Data Annotations namespace to apply to classes and properties to enable various pre-defined validation rules. You can easily work with these annotations by obtaining them from various Visual Studio 2010 project versions, including ASP.NET MVC, Web Forms, ASP.NET Apps & Web Sites, Dynamic Data & non ASP.NET projects such as Silver-light and WPF. So, for data models also, one can easily use these annotations with POCOs feature that is commonly pronounced as plain old CLR objects, EF models and Linq2SQL models. But if we talk universally, data annotations can be used anywhere. If you’re planning to Hire Asp. Net Developers for a brilliant online presence, Xicom can help you. Know More at - http://www.xicom.biz/offerings/hire-asp.net-programmers/

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Validation Process Using Data Annotation In ASP .NET MVC What are Data Annotations Data annotations define the list of attribute classes that can be found in System. ComponentModel. DataAnnotations namespace to apply to classes and properties to enable various pre-defined validation rules. You can easily work with these annotations by obtaining them from various Visual Studio 2010 project versions including ASP.NET MVC Web Forms ASP.NET Apps Web Sites Dynamic Data non ASP.NET projects such as Silverlight and WPF. So for data models also one can easily use these annotations with POCOs feature that is commonly pronounced as plain old CLR objects EF models and Linq2SQL models. But if we talk universally data annotations can be used anywhere. You will come across various box annotations such as:  Required  Regular Expression  Range  ZipCode  DisplayName  DisplayFormat  Scaffold  DataType  StringLength There are various ASP .NET Development company who posses ample of expertise and high proficiency skills in ASP.NET Development sector. But to be one of the most renowned ASP.NET development company its necessary for every employer to focus on hiring an eventually sound.NET developer who will bring out the maximum and best output to you.

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Some of our areas of .NET expertise includes:  High performance application architectures  Stringent Coding practices  Ease of Maintenance systems  Cost Effective Delivery Modes How to work with Data Annotation Validator Attributes At the time of working with Data Annotations Model Binder we need validator attributes to perform such validation process in ASP.NET MVC. You need to add System.ComponentModel.DataAnnotations namespace that comprises of following validator attributes: Range – validates the property value that falls within a specific range of values. ReqularExpression – verifies property value to match a specified regular expression pattern. Required – Allows us to mark a property as per the requirement. StringLength – Lets you specify a maximum length for your string property. Validation – Defines a base class for all validator attributes. The Employee class in Listing 1 guides how to use this validator feature. The Name AboutMe and Salary properties are marked as per requirements are concerned. The Name property should consist a string length that should be less than fifty characters. The Salary property should properly match the Regular Expression pattern to represent a employes salary properly. using System.ComponentModel.DataAnnotations namespace MvcApplication.Model public class Employee public int EmployeeId get set Required StringLength30 public string Name get set

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Required public string AboutMe get set DisplayName "Employee Salary" Required RegularExpression"\\d+\.\d2"ErrorMessage"Employee Salary must be a decimal value" public decimal Salary get set List 1: The Employee class deals with coding guides user about how to use additional attribute: the Display attribute. The Display attributes allows you to modify the property name at the time property is displayed as an error message. Employee class in Listing 1 with Create controller action feature in Listing 2 can easily be used together. This controller action will again display the Create view property at the time when a model state will contain errors. using System.Web.Mvc using MvcApplication.Models namespace MvcApplication.Controllers public class EmployeeController : Controller // // GET: /Employee/Create public ActionResult Create return View // // POST: /Employee/Create AcceptVerbsHttpVerbs.Post public ActionResult CreateBindExclude "EmployeeId"Employee employeModel if ModelState.IsValid return View // TODO: Add insert logic here return RedirectT oAction"Index"

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List 2: Controllers\EmployeeController.cs Create the view feature in Listing 3 by simply right-clicking on Create action and then select the menu option known as Add View. Create a view with the Employee class as a model class. Again select Create option from the view content dropdown list. model MvcApplication.Models.Employee ViewBag.Title "Create" Layout "/Views/Shared/_Layout.cshtml" h2Create/h2 using Html.BeginForm Html.AntiForgeryT oken div class"form-horizontal" h4Employee/h4 hr /

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Html.ValidationSummarytrue div class"form-group" Html.LabelFormodel model.Name new class "control-label col-md-2" div class"col-md-10" Html.EditorFormodel model.Name Html.ValidationMessageFormodel model.Name /div /div div class"form-group" Html.LabelFormodel model.AboutMe new class "control- label col-md-2" div class"col-md-10" Html.EditorFormodel model.AboutMe Html.ValidationMessageFormodel model.AboutMe /div /div div class"form-group" Html.LabelFormodel model.Salary new class "control-label col-md-2" div class"col-md-10" Html.EditorFormodel model.Salary Html.ValidationMessageFormodel model.Salary /div /div div class"form-group" div class"col-md-ofset-2 col-md-10" input type"submit" value"Create" class"btn btn-default" / /div /div /div div Html.ActionLink"Back to List" "Index" /div section Scripts Scripts.Render"/bundles/jqueryval"

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List 3: Views\Employee\Create.cshtml At the time of submitting a form to create any Employee if you do not enter the specific values for all the required fields then the validation error messages in Figure 3 will be displayed. If you enter an invalid value in Salary then the error message in Figure 4 is displayed.

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Steps To Work With Data Annotation Validators with the Entity Framework If you are working with the Microsoft Entity Framework to validate a data model class then its not possible to apply validator attributes directly to classes. The reason behind this: Entity Framework Designer generates various model classes and any modifications that are made to the model class will be overwritten next time if you come across with any changes in the Designer. To use validators with classes that are generated by the Entity Framework with ASP.NET MVC then its necessary to create metadata classes first. Apply validates to your metadata class. Figure 5: State class generated by Entity Framework

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using System.ComponentModel.DataAnnotations namespace MvcApplication.Model MetadataT ypetypeof StateMetaData public partial class State public class StateMetaData Required DisplayName"State Name" public object StateName get set Listing 4: Models\State.cs The file in Listing 4 comprises of two classes that are known as State class and StateMetaData class. Here State class is a partial class that easily corresponds to the partial class at the time time it is generated by Entity Framework contained in the DataModel.Designer.vb file. Note: But currently .NET framework does not support partial properties. Here State partial class is developed with MetadataType attribute that signifies the StateMetaData class. StateMetaData class comes with proxy setting properties for State class property. The page in Figure 6 illustrates the error messages returned when you enter invalid values for the State properties.

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Figure 6: Using validators with the Entity Framework To work with ASP.NET MVC Data Annotations it is necessary to hire a highly experienced Asp .NET Developer who possesses high.NET coding skills. Qualities of a good .NET Developers :-  Experienced and qualified professionals  Strong technical knowledge  Proven methodologies  Effective communication  Thorough technical expertise  Fast turnaround time  Committed to deliver ASP.NET development services to match clients expectaions  Analytical Approach towards programming

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