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Validation failed for one or more entities. See 'EntityValidationErrors' property for more details

While using EF 4.1 code-first to insert data into a SQL Server database. If there is a validation error, EF throws a DbEntityValidationException whose EntityValidationsErrors contains the details of the issue.
For example you have set one field as required while creating model, but while saving data in that entity user have supplied Null value to that required field, EF throws a DbEntityValidationException. There can be many other validation errors as well, and to see what exactly error EF is throwing, you can write you SaveChanges method in try..catch block as:

catch (DbEntityValidationException e)
    foreach (var error in e.EntityValidationErrors)
         Console.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
         error.Entry.Entity.GetType().Name, error.Entry.State);
         foreach (var ve in error.ValidationErrors)
             Console.WriteLine("-Property: \"{0}\", Error: \"{1}\"",
                                      ve.PropertyName, ve.ErrorMessage);

EntityValidationErrors is a collection which represents the entities which couldn't be validated successfully, and the inner collection ValidationErrors per entity is a list of errors on property level.
These validation messages are usually helpful enough to find the source of the problem. I have simply write these errors with the help of Console.WriteLine, however you can write error in error log file or anywhere else you want as per your requirement.

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