问如何将相同的var类型变量赋给不同的linq to sql结果集？

EN

IEnumerable<CustomClass> resultSet = null;// Must be assigned to something

if(somecondition)
{
   resultSet= (from t1 in table1 where t1.id= 1 select new CustomClass {name='test1'})
}
if(anotherCondition)
{
   resultSet = (from t2 in table2 where t2.id= 1 select new CustomClass {name='test2'})
}

resultSet= resultSet.OrderByDescending(d => d.Id)
                              .ToArray()

var count= resultSet.Count();

public class SomeClass
{
    public IEnumerable<CustomClass> ResultSet { get; private set; } = new List<CustomClass>();

    //Pseudo: values and conditions are just indicative of logic.
    public void SomeMethod(someValue, someOtherValue)
    {
        IQueryable<CustomClass> resultSet = null;
        if(somecondition)
            resultSet = (from t1 in table1 where t1.id= 1 select new CustomClass {name='test1'});
       else if(anotherCondition)
            resultSet = (from t2 in table2 where t2.id= 1 select new CustomClass {name='test2'});
       else
           throw new ArgumentException("Invalid combination of conditions.");
         
    ResultSet = resultSet.OrderByDescending(d => d.Id)
        .ToArray();

    var count= resultSet.Count;

}