public class CodeFirstTable1
{
        [SugarColumn(IsIdentity = true, IsPrimaryKey = true)]
        public int Id { get; set; }
        public string Name { get; set; }
        [SugarColumn(ColumnDataType = "Nvarchar(255)")]//custom
        public string Text { get; set; }
        [SugarColumn(IsNullable = true)]
        public DateTime CreateTime { get; set; }
}

db.CodeFirst.InitTables(typeof(CodeFirstTable1));//Create table