How to do model field validation in asp.net c# MVC

Debasis Mohapatra

Please find the below model code. I want to do field validation. why the viewbag.msg doesn't show the error that [Required(ErrorMessage = "User is required for mobile model details")]

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using System.Web;

namespace SudentRegistration_MVC_Project.Models

{

public class Mobile

{

public int id { get; set; }

public string Mobile_brand { get; set; }

[Required(ErrorMessage = "User is required for mobile model details")]

public string mobile_model { get; set;}

public int mobile_price { get; set; }

public string mobile_description { get; set; }

public List MobileList { get; set; }

}

3 Replies

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Jignesh Kumar7y ago
Hi Debasis,

Please use below link for model validation.
https://www.dotnettricks.com/learn/mvc/mvc-data-annotations-for-model-validation

http://www.tutorialsteacher.com/mvc/implement-validation-in-asp.net-mvc
Sanwar Ranwa7y ago
Hello Debasis

Use @Html.ValidationMessageFor

@Html.ValidationMessageFor(model => model.name, "", new { @class = "text-danger" })

Please check these Links

http://www.tutorialsteacher.com/mvc/implement-validation-in-asp.net-mvc

https://www.c-sharpcorner.com/UploadFile/13048b/model-validation-in-Asp-Net-mvc909/

https://docs.microsoft.com/en-us/aspnet/mvc/overview/older-versions/getting-started-with-aspnet-mvc4/adding-validation-to-the-model

https://docs.microsoft.com/en-us/aspnet/core/mvc/models/validation?view=aspnetcore-2.2
Abhishek Sur7y ago
You need to use ValidationMessageFor and ValidationSummary in Razor to perform the task.

http://www.tutorialsteacher.com/mvc/implement-validation-in-asp.net-mvc

This one might help.