public class Tasks
    {
        public Tasks()
        {
            this.Tags = new List<Tag>();
        }

        public int TaskId { get; set; }

        public int UserId { get; set; }

        public string TaskName {get;set;}
        public virtual UserInfo UserInfo { get; set; }
        public virtual ICollection<Tag> Tags { get; set; }
    }

public class Tag
    {
        public Tag()
        {
            this.Tasks = new List<Tasks>();
        }

        public int TagId { get; set; }
        public int UserId { get; set; }
        public string TagName { get; set; }
        public virtual UserInfo UserInfo { get; set; }
        public virtual ICollection<Tasks> Tasks { get; set; }
    }
        

           //Mapping 

            // Relationships
            this.HasMany(t => t.Tags)
                .WithMany(t => t.Tasks)
                .Map(m =>
                    {
                        m.ToTable("TaskTag");
                        m.MapLeftKey("TaskId");
                        m.MapRightKey("TagId");
                    });

select tasks.* from tasks
left join tasktag on tasks.taskid = tasktag.taskid
left join tag on  tag.tagid = TaskTag.tagid 
where tag.tagname='test'