How to Avoid validation for a required field which is not present in view?

See more:

WebAPI

MVC5

entity-framework

Applying validation for a postcode field which is a requried but while editing iam not using postcode in my form even iam not using it iam getting error '

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

'

catch (System.Data.Entity.Validation.DbEntityValidationException dbEx)
           {
               Exception raise = dbEx;
               foreach (var validationErrors in dbEx.EntityValidationErrors)
               {
                   foreach (var validationError in validationErrors.ValidationErrors)
                   {
                       string message = string.Format("{0}:{1}",
                           validationErrors.Entry.Entity.ToString(),
                           validationError.ErrorMessage);
                       // raise a new exception nesting
                       // the current instance as InnerException
                       raise = new InvalidOperationException(message, raise);
                   }
               }
               throw raise;
           }

by using above code iam able to trace my what is exact error. is showing enter postcode which was not present in my form. (postcode is in my model class which is requried)
plz Help me out??