Umbraco package UI-O-Matic examples (https://our.umbraco.org/projects/developer-tools/ui-o-matic/)

OnePageImpactReport.Models.cs

namespace OnePageImpactReport.Models
{
    [UIOMaticAttribute("ImpactOrganisations", "icon-users", "icon-user")]
    [TableName("ImpactOrganisations")]
    [PrimaryKey("Id", autoIncrement = true)]
    [ExplicitColumns]
    public class ImpactOrganisation : IUIOMaticModel
    {
        [UIOMaticIgnoreField]
        [Column("id")]
        [PrimaryKeyColumn(AutoIncrement = true)]
        public int Id { get; set; }

        [Required]
        [Column("OwnerMemberId")]
        [UIOMaticField("Owner Member", "", View = "pickers.member")]
        public int OwnerMemberId { get; set; }
        
        [Column("OrganisationName")]
        [Required]
        public string Name { get; set; }

        [Column("LogoUrl"), NullSetting(NullSetting = NullSettings.Null)]
        public string LogoUrl { get; set; }

        [Column("Summary"), NullSetting(NullSetting = NullSettings.Null)]
        [AllowHtml]
        [MaxLength(200)]
        [UIOMaticField("Summary", "Appears on all reports", View = "textarea")]
        public string Summary { get; set; }


        [Column("Email"), NullSetting(NullSetting = NullSettings.Null)]
        public string Email { get; set; }
        [Column("Tel"), NullSetting(NullSetting = NullSettings.Null)]
        public string Tel { get; set; }
        [Column("Url"), NullSetting(NullSetting = NullSettings.Null)]
        public string Url { get; set; }

        [Column("Legal"), NullSetting(NullSetting = NullSettings.Null)]
        [UIOMaticField("Legal", "Appears in report footer", View = "textarea")]
        public string Legal { get; set; }


        public IEnumerable<Exception> Validate()
        {
            var exs = new List<Exception>();

            if (string.IsNullOrEmpty(Name))
                exs.Add(new Exception("Name is required"));
            if (OwnerMemberId == 0)
                exs.Add(new Exception("Owner Member is required"));
            return exs;
        }
        public override string ToString()
        {
            return Name + " (" + OwnerMemberId + ")";
        }

    }
    
}