Data Validation in Entity Framework

Validating data is important to make sure bad data is not getting into the system causing unnecessary troubles. When developing applications using Entity Framework, you can use features in .NET and Entity Framework to ensure only valid data will flow through it. Here we'll see what features we can use with Entity Framework to do our job

Using Data-Annotations

Data-Annotations are attributes you can add to property or a class. Data-Annotations are not a feature comes with Entity Framework. It's a feature of MVC. You must add System.ComponentModel.DataAnnotations to use this. 

How to use Data Annotations with Code First

Extra : Using Data-Annotations with ASP.NET MVC

IValidatableObject

Its is an interface which can be applied to a class. 

http://weblogs.asp.net/scottgu/class-level-model-validation-with-ef-code-first-and-asp-net-mvc-3

http://stackoverflow.com/questions/3400542/how-do-i-use-ivalidatableobject

ValidateEntity

http://msdn.microsoft.com/en-us/library/system.data.entity.dbcontext.validateentity%28v=vs.113%29.aspx 

http://www.remondo.net/entity-framework-validation-dbcontext-validateentity/

http://stackoverflow.com/questions/20964824/custom-validation-within-dbcontext-validateentity-throws-objectdisposedexception

DbUpdateException

Exception throws by Entity Framework when updating to the database gets fails

References

https://www.simple-talk.com/dotnet/.net-framework/catching-bad-data-in-entity-framework/

updated November 2014