Entity Framework Code first making a column non-nullable

Question

I am using EF code first for my project. I have following code in my DataModel

[HiddenInput(DisplayValue = false)]        
public DateTime? PasswordDate { get; s         


        

Answer 1

That's because you allowed NULL values in that column, then tried to make it non-nullable. It will subsequently try to migrate your existing data into that newly non-nullable column, which will break because you already have NULL values in there.

Two solutions:

1) Change it back to nullable
2) Give it a default value for items that don't have a value.