namespace System.ComponentModel { public sealed class DataObjectFieldAttribute : Attribute { public bool IsIdentity { get; } public bool IsNullable { get; } public int Length { get; } public bool PrimaryKey { get; } public DataObjectFieldAttribute(bool primaryKey); public DataObjectFieldAttribute(bool primaryKey, bool isIdentity); public DataObjectFieldAttribute(bool primaryKey, bool isIdentity, bool isNullable); public DataObjectFieldAttribute(bool primaryKey, bool isIdentity, bool isNullable, int length); } }