.NET (Core and Framework)

There is no Unicode byte order mark. Cannot switch to Unicode

<?xml version="1.0" encoding="UTF-8"?>

-<OrderUpdateReply>


-<Error>



<ErrorDescription>There is no Unicode byte order mark. Cannot switch to Unicode.</ErrorDescription>

</Error>

</OrderUpdateReply>

private async Task<string> QueryOrders(string key, string accountName)
        {
            string XMLstring = CalculateOrderQueryXML(key, accountName);
            StringContent stringcontent = new StringContent(XMLstring);
            stringcontent.Headers.ContentType.MediaType = "text/XML";
            HttpResponseMessage response = await http.PostAsync("https://www.mywebsite.com/shared/xml/orderquery.rest", stringcontent);

            /*string for response*/
            string ResponseString = await response.Content.ReadAsStringAsync();

            XmlDocument xml = new XmlDocument();
            xml.LoadXml(ResponseString);
    
            return xml.OuterXml;

        }

Hello, I have an error in the dll resource

Spec.File.system.dll

public partial class InspectionResult
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public InspectionResult()
    {
        this.EventLogs = new HashSet<EventLog>();
        this.InspectionItems = new HashSet<InspectionItem>();
        this.InspectionResultStatCounts = new HashSet<InspectionResultStatCount>();
        this.NOVs = new HashSet<NOV>();
        this.UploadedDocuments = new HashSet<UploadedDocument>();
        this.AspNetUsers = new HashSet<AspNetUser>();
    }

    public int InspectionResultId { get; set; }

    public string EnteredById { get; set; }

    public string CreatedByUserId { get; set; }
    public string UpdatedByUserId { get; set; }

    public virtual AspNetUser AspNetUser { get; set; }
    public virtual AspNetUser AspNetUser1 { get; set; }
    public virtual AspNetUser AspNetUser2 { get; set; }

    public virtual ICollection<AspNetUser> AspNetUsers { get; set; }
}

myOrphanList =
        (
            from v in allViolations
            from r in allInspectionResults
            from i in allItems
            where
                r.InspectionResultId == i.InspectionResultId &&
                i.InspectionItemId == v.InspectionItemId
            select new OrphanViolationsReport
            {
                ViolationId = v.ViolationId,
                ViolationNumber = v.ViolationNumber,
                ViolationDate = v.ViolationDate,
                ViolationType = v.ViolationType.ViolationTypeCode,
                ItemYear = i.ItemYear,
                ItemMakeManufacturer = i.ItemMakeManufacturer,
                ItemModel = i.ItemModel,
                VIN = i.VIN,
                PIN = i.PIN,
                InspectionResultId = r.InspectionResultId,
                InspectionResultNumber = r.InspectionRequestNumber,
                DealerDmvNumber = r.DealerDmvNumber,
                InspectedCompanyName = (from a in contacts where a.ContactId == r.InspectedCompanyDataId select a.FirstName)?.FirstOrDefault()
            }
        ).ToList();

An expression tree lambda may not contain a null propagating operator

[StringLength(7999)]
    public string EventComment { get; set; }

public partial class AlterColumnLemgthEventComment : DbMigration
    {
            public override void Up()
            {
            }
            
            public override void Down()
            {
            }
    }

The field EventComment must be a string with a maximum length of 1000.

The Designer Code for this migration file includes a snapshot of your current Code First model. This snapshot is used to calculate the changes to your model when you scaffold the next migration. 
If you make additional changes to your model that you want to include in this migration, then you can re-scaffold it by running 'Add-Migration AlterColumnLemgthEventComment' again.