Lambda Expression for Many to Many realtionship in C# EF 5 Code First

I'm using EF 5 Code First and VS 2012. I have classes for Articles and Tags. Each Article will have atleast one Tag associated. Please see the classes below. ``` public class Article { public int ArticleId { get; set; } public virtual ICollection<ArticleTag> Tags { get; set; } } public class Tag { public int TagId { get; set; } public string TagName { get; set; } } public class ArticleTag { public int ArticleId { get; set; } public int TagId { get; set; } // navigation property public virtual Article Article { get; set; } public virtual Tag Tag { get; set; } } ``` Below is the code I tried. requestTags contains the list of TadgIds. repBase is db context. But below code is returing all Articles. ``` var idList = requestTags.tags.Select(t => t.id).ToList(); var result= repBase.GetAll<Article>().Select(tg => tg.Tags.Where(tk => idList.Contains(tk.TagId))).ToList(); ``` Please hlep me to get list of articles for a given list of TagIds. Thanks in advance.