Generic programming method to remove duplicate data in fields

public partial class V_MyJoinedCloudRespository

{

        public List<V_MyJoinedCloud> GetDistinctJoinedCloud(string cloudName,long ExpertId)
        {
            var lamd = from p in db.V_MyJoinedCloud
                       where == 1 && (cloudName) && ==ExpertId
                       select p;

            List<V_MyJoinedCloud> list = new List<V_MyJoinedCloud>();
            if (lamd!=null&&()>0)
            {
                list = ();
                list = (new CompanyNameComparer()).ToList();
            }
            return list;
        }

}

public class CompanyNameComparer : IEqualityComparer<V_MyJoinedCloud>
    {
        public bool Equals(V_MyJoinedCloud x, V_MyJoinedCloud y)
        {
            if (x == null)
                return y == null;
            return == ;
        }

        public int GetHashCode(V_MyJoinedCloud obj)
        {
            if (obj == null)
                return 0;
            return ();
        }
    }