Я пытаюсь создать предложение where динамически в запросе LINQ, который ссылается на таблицы через EF, но я получаю следующую ошибку:

'ClaimantLastName' could not be resolved in the current scope or context. Make sure that all referenced variables are in scope, that required schemas are loaded, and that namespaces are referenced correctly. Near member access expression, line 6, column 2.

Вот что я пытаюсь:

string whereClause = string.Format("ClaimantLastName = '{0}' and ClaimantSSN = '{1}'", lastName, ssn);

Я тоже пробовал без одинарных кавычек безрезультатно.

Вот актуальный запрос:

return db.Claims.Where(whereClause).Select(
                    u => new AdvancedSearchResult
                    {
                        ClaimNumber = u.ClaimNumber,
.
.
.

Возможно ли то, что я пытаюсь сделать? Это кажется очень простым. Куда я иду не так?

ОБНОВИТЬ: Здесь находится объект претензии.

public static Claim CreateClaim(global::System.Int32 id, global::System.String claimantFirstName, global::System.String claimantLastName, global::System.String claimantSSN, global::System.DateTime dateOfInjury, global::System.String claimNumber, global::System.String claimantMiddleName, global::System.String claimantAddress1, global::System.String claimantAddress2, global::System.String claimantCity, global::System.String claimantState, global::System.String claimantZip, global::System.DateTime claimantDateOfBirth, global::System.String compensability, global::System.Boolean injuryType, global::System.String jurisdictionState, global::System.String status, global::System.String condition, global::System.String managingBranch, global::System.String bodyPart, global::System.String acceptedBodyPart, global::System.Boolean pGCase, global::System.String employersDefenseAttorney, global::System.String accidentDescription, global::System.String claimExaminerFirstName, global::System.String claimExaminerLastName, global::System.String claimExaminerEmail, global::System.String claimantAttorney, global::System.String workerId, global::System.String workerType)
{
    Claim claim = new Claim();
    claim.Id = id;
    claim.ClaimantFirstName = claimantFirstName;
    claim.ClaimantLastName = claimantLastName;
    claim.ClaimantSSN = claimantSSN;
    claim.DateOfInjury = dateOfInjury;
    claim.ClaimNumber = claimNumber;
    claim.ClaimantMiddleName = claimantMiddleName;
    claim.ClaimantAddress1 = claimantAddress1;
    claim.ClaimantAddress2 = claimantAddress2;
    claim.ClaimantCity = claimantCity;
    claim.ClaimantState = claimantState;
    claim.ClaimantZip = claimantZip;
    claim.ClaimantDateOfBirth = claimantDateOfBirth;
    claim.Compensability = compensability;
    claim.InjuryType = injuryType;
    claim.JurisdictionState = jurisdictionState;
    claim.Status = status;
    claim.Condition = condition;
    claim.ManagingBranch = managingBranch;
    claim.BodyPart = bodyPart;
    claim.AcceptedBodyPart = acceptedBodyPart;
    claim.PGCase = pGCase;
    claim.EmployersDefenseAttorney = employersDefenseAttorney;
    claim.AccidentDescription = accidentDescription;
    claim.ClaimExaminerFirstName = claimExaminerFirstName;
    claim.ClaimExaminerLastName = claimExaminerLastName;
    claim.ClaimExaminerEmail = claimExaminerEmail;
    claim.ClaimantAttorney = claimantAttorney;
    claim.WorkerId = workerId;
    claim.WorkerType = workerType;
    return claim;
}

ОБНОВИТЬ: Добавлен предложенный Полом код в качестве пробной версии. Это на самом деле работает.

whereClause = string.Format("ClaimantLastName = \"{0}\" and ClaimantSSN = \"{1}\"", lastName, ssn);

                   List<URIntake.Claim> claims = new List<Claim>();
URIntake.Claim claim = new Claim();
claim.ClaimantFirstName = "Jay";
claim.ClaimantLastName = "Williams";
claim.ClaimantSSN = "654219870";
claim.ClaimantDateOfBirth = new DateTime(1993, 1, 2);
claims.Add(claim);

claim = new Claim();
claim.ClaimantFirstName = "Santa";
claim.ClaimantLastName = "Claus";
claim.ClaimantSSN = "012345678";
claim.ClaimantDateOfBirth = new DateTime(1893, 1, 2);
claims.Add(claim);

List<AdvancedSearchResult> selectedClaims = claims.AsQueryable().Where(whereClause).Select(
    u => new AdvancedSearchResult
    {
        ClaimNumber = u.ClaimNumber,
        DateOfBirth = u.ClaimantDateOfBirth,
        DateOfInjury = u.DateOfInjury,
        Denied = u.Compensability == "Denied"
    }).ToList();