Can't insert long string to database table in Orchard

Question

I created table

    private static void CreateTable(SchemaBuilder builder) {
        builder.CreateTable(typeof(RkeeperV7MenuRecord).Name, table => table
            .Column<int>("Id", c => c.PrimaryKey().Identity())
            .Column<int>("SpotId", c => c.NotNull())
            .Column<DateTime>("Date", c => c.NotNull())
            .Column<string>("OriginalData", c => c.NotNull().Unlimited())
            );

and table in SQL Server database was created (and string has max in legth property). If i generate SQL table script from DB server it will be like this (so string is marked as unlimited)

CREATE TABLE [dbo].[Plus_Plus_SpotServerIntegration_Rkeeper_RkeeperV7MenuRecord](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [SpotId] [int] NOT NULL,
    [Date] [datetime] NOT NULL,
    [OriginalData] [nvarchar](max) NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

But... When i try to insert record in table, nhibernate throw exception "Error dehydrating property value for Plus.SpotServerIntegration.Rkeeper.Models.RkeeperV7MenuRecord.OriginalData" and inner exception is "The length of the string value exceeds the length configured in the mapping/parameter." What should i do to insert record?

PS string is about 100000 simbols (it is xml)

            _rkeeperV7MenuRepositiory.Create(new RkeeperV7MenuRecord {
                OriginalData = model.OriginalData,
                SpotId = spot.Id,
                Date = _clock.UtcNow
            });

where

private readonly IRepository<RkeeperV7MenuRecord> _rkeeperV7MenuRepositiory;

Answer 1

Got it! Should mark Property record by attribute "StringLengthMax" like this

public class RkeeperV7MenuRecord : DefaultEntityRecord {
    public virtual int SpotId { get; set; }
    public virtual DateTime Date { get; set; }
    [StringLengthMax]
    public virtual string OriginalData { get; set; }
}