C# Linq "Entity with the same key '0' already added." when inserting multiple rows

Question

I am trying to insert data in bulk, database is MySQL connection is done using Devart LinqConnect. Here is a code:

DataContext db = new DataContext();
List<XYData> XYDList = new List<XYData>(); // Data Type
List<xydata> xyToBeInsrted = new List<xydata>(); // Database table

XYDList = XYData.genXYData(12, 1234); // Generates 12 example records 

foreach (XYData oneXY in XYDList)
{
    // Create clear row representation               
    xydata xy_row = new xydata();
    // Assign data from object
    xy_row.id = oneXY.Id;
    xy_row.Batchid = (int)oneXY.BatchId;
    xy_row.Ch = oneXY.Channel;
    xy_row.Value = oneXY.Value;
    xy_row.Pos = (int)oneXY.Position;
    xy_row.Dtm = oneXY.Time;

    // Add to list of rows to be inserted
    xyToBeInsrted.Add(xy_row);

}
db.xydatas.InsertAllOnSubmit<xydata>(xyToBeInsrted);
db.SubmitChanges();

Last line gives an error "Entity with the same key '0' already added." When I lower number of items to be generated to 1 then it works. Anything above 1 gives error.

Table has set Auto Increment on record Id field.

Trying to solve that for 2 hours without success.

EDIT: Data Class:

 public class XYData
 {
   [Column(IsPrimaryKey = true, IsDbGenerated = true)]
   public int Id { get; set; }

   public int BatchId { get; set; }
   public int Channel { get; set; }
   public String Value { get; set; }
   public double Position { get; set; }
   public DateTime Time { get; set; }

   private static Random rand = new Random();

   public XYData(int channel = 0, string val = "")
   {
       Channel = channel;
       Value = val;
       Position = 0;
       Time = DateTime.Now;
   }

   public static List<XYData> genXYData(int howMany, int batchId)
   {
       List<XYData> _allXYData = new List<XYData>();
       for (int i = 0; i < howMany; i++)
       {
           XYData _singleXY = new XYData();
           _singleXY.BatchId = batchId;
           for (int j = 64 * (1 << i); j > 0; j--)
           {
               uint k = (uint)rand.Next(int.MaxValue);
               _singleXY.Value += k.ToString("X8");
           }
           _allXYData.Add(_singleXY); // Add to list
       }
       return _allXYData; // Return list of generated data.
   }
 }

Answer 1

Something like this may be needed on your model definition -

[Column(IsPrimaryKey=true, IsDbGenerated=true)]
public int Id { get; set; }

http://www.devart.com/linqconnect/docs/PrimaryKeyMapping.html