Metadata Class for Data Validation in asp.net MVC Database First

For validate data to your database first model, add a class Metadata.cs to your Models folder.
Now write code in metadata class like this:

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using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; namespace POSMSWeb.Models { public class CustomerMetadata { [Display(Name = "Client Name")] public string CustomerName; [Display(Name = "Client Address")] public string CustomerAddress; [Display(Name = "Phone Number")] public string CustomerPhone; [Display(Name = "Mobile Number")] public string CustomerMobile; [Display(Name = "FAX Number")] public string CustomerFax; [Display(Name = "Client Email")] public string CustomerEmail; [Display(Name = "Client Note")] public string CustomerNote; } }

Now, you must associate the model classes with the metadata classes.

In the Models folder, add a class named PartialClasses.cs

Replace the contents of the file with the following code:

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using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.Linq; using System.Web; namespace POSMSWeb.Models { [MetadataType(typeof(CustomerMetadata))] public partial class tbl_Customer { } }