using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        foreach (var item in Do())

        {

            Console.WriteLine(item);

        }

    }

    public static IQueryable Do()

    {

        IEnumerable<dynamic> queryResults = null;

        IEnumerable<Table> table = (new List<Table>{ new Table { column1 = "Table" } });

        IEnumerable<Chair> table2 = (new List<Chair>{ new Chair { column1 = "Chair" } });

        bool flag = true;

        if(flag) 

        {

          queryResults = (from t1 in table

                          select new { column1 = t1.column1 });

        } else 

        {

          queryResults = (from t2 in table2

                          select new { column1 = t2.column1 });

        }

        foreach (var item in queryResults)

        {

           var someresult = (from t3 in table where t3.column1 == item.column1 select t3);

        }

        return queryResults.AsQueryable();

    }

}

​

​

public class Table

{

    public string column1 { get; set; }

}

​

public class Chair

{

    public string column1 { get; set; } 

}