Symbiotic ORM Core Save data

TestCreate.cs

    public void TestCreate()
    {
        private IDatabaseTypesFactory factory = new DatabaseTypesFactorySqlServer();
        
        // Intialize database connection string
        factory.ConnectionString = "Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=D:\\Dev\\FrozenElephant\\SymbioticORM\\SqlDatabase\\SymbioticTestLocal.mdf;Integrated Security=True;Connect Timeout=30";

        //Create the object to save
        ErrorItem er = new ErrorItem();
        er.ItemDate = DateTime.Now;
        er.Text = text;
        
        //write it to the database
        IObjectWriter writer = factory.CreateObjectWriter();
        writer.Create(er);

        //Check that it is in the DB
        IObjectLoader loader = factory.CreateObjectLoader();
        ErrorItem s = loader.ObtainItem<ErrorItem>(er.Id);
        if (s == null)
        {
            Assert.Fail();
        }
    }
    
using System;
using System.Diagnostics;
using FrozenElephant.Symbiotic;

[Serializable()]
[DatabaseTable("Errors")]
[DebuggerDisplay("ErrorItem: {m_Id} {m_ItemDate} {m_Text}")]
public class ErrorItem : IObjectChangedSupport {

    private DateTime m_ItemDate = new DateTime(1950, 1, 1);
    private string m_Text;

    private long m_Id;
    public ErrorItem() {
        m_Isnew = true;
    }

    [DatabaseColumnAttribute("ErrorId", IsPrimaryKey = true, IsIdentityColumn = true)]
    public long Id {
        get { return m_Id; }
        set { m_Id = value; }
    }

    [DatabaseColumnAttribute("Date")]
    public DateTime ItemDate {
        get { return m_ItemDate; }
        set {
            if (m_ItemDate.Equals(value) == false && m_Isnew == false) {
                m_IsChanged = true;
            }
            m_ItemDate = value;
        }
    }

    [DatabaseColumnAttribute("ErrorInfo")]
    public string Text {
        get { return m_Text; }
        set {
            if ((m_Text != null) && m_Text.Equals(value) == false && m_Isnew == false) {
                m_IsChanged = true;
            }
            m_Text = value;
        }
    }

    #region "IObjectChangedSupport implements"

    private bool m_Isnew;

    private bool m_IsChanged;

    public bool IsChanged() {
        return m_IsChanged;
    }

    public bool IsNew() {
        return m_Isnew;
    }

    public void MarkAsOld() {
        m_Isnew = false;

    }

    public void MarkAsUnchanged() {
        m_IsChanged = false;
    }

    #endregion

}