I am currently getting this error:

System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session.

while running this code:

public class ProductManager : IProductManager
{
    #region Declare Models
    private RivWorks.Model.Negotiation.RIV_Entities _dbRiv = RivWorks.Model.Stores.RivEntities(AppSettings.RivWorkEntities_connString);
    private RivWorks.Model.NegotiationAutos.RivFeedsEntities _dbFeed = RivWorks.Model.Stores.FeedEntities(AppSettings.FeedAutosEntities_connString);
    #endregion

    public IProduct GetProductById(Guid productId)
    {
        // Do a quick sync of the feeds...
        SyncFeeds();
        ...
        // get a product...
        ...
        return product;
    }

    private void SyncFeeds()
    {
        bool found = false;
        string feedSource = "AUTO";
        switch (feedSource) // companyFeedDetail.FeedSourceTable.ToUpper())
        {
            case "AUTO":
                var clientList = from a in _dbFeed.Client.Include("Auto") select a;
                foreach (RivWorks.Model.NegotiationAutos.Client client in clientList)
                {
                    var companyFeedDetailList = from a in _dbRiv.AutoNegotiationDetails where a.ClientID == client.ClientID select a;
                    foreach (RivWorks.Model.Negotiation.AutoNegotiationDetails companyFeedDetail in companyFeedDetailList)
                    {
                        if (companyFeedDetail.FeedSourceTable.ToUpper() == "AUTO")
                        {
                            var company = (from a in _dbRiv.Company.Include("Product") where a.CompanyId == companyFeedDetail.CompanyId select a).First();
                            foreach (RivWorks.Model.NegotiationAutos.Auto sourceProduct in client.Auto)
                            {
                                foreach (RivWorks.Model.Negotiation.Product targetProduct in compa
c# entity-framework transactions inversion-of-control
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