Entity Framework CTP 4. “Cannot insert the value NULL into column” – Even though there is no NULL value
i have the same issue here and it’s really an ugly solution. [Key] public Int64 PolicyID { get; set; } this is NOT an auto generated number then i hit the same error. EF Code First CTP5 after apply this: [Key] [DatabaseGenerated(DatabaseGeneratedOption.None)] public Int64 PolicyID { get; set; } then it will work.