c# linq how to make join of three tables code example

Example 1: join two tables in linq c#inner join

var results = from c in db.Companies
              join cn in db.Countries on c.CountryID equals cn.ID
              join ct in db.Cities on c.CityID equals ct.ID
              join sect in db.Sectors on c.SectorID equals sect.ID
              where (c.CountryID == cn.ID) && (c.CityID == ct.ID) && (c.SectorID == company.SectorID) && (company.SectorID == sect.ID)
              select new { country = cn.Name, city = ct.Name, c.ID, c.Name, c.Address1, c.Address2, c.Address3, c.CountryID, c.CityID, c.Region, c.PostCode, c.Telephone, c.Website, c.SectorID, Status = (ContactStatus)c.StatusID, sector = sect.Name };


return results.ToList();

Example 2: join in linq c#

IList<string> strList1 = new List<string>() { 
    "One", 
    "Two", 
    "Three", 
    "Four"
};

IList<string> strList2 = new List<string>() { 
    "One", 
    "Two", 
    "Five", 
    "Six"
};

var innerJoin = strList1.Join(strList2,
                      str1 => str1, 
                      str2 => str2, 
                      (str1, str2) => str1);