public class TipComparer : IEqualityComparer<TipDetails>

        {

            public bool Equals(TipDetails x, TipDetails y)

            {

                if (Object.ReferenceEquals(x, y)) return true;

                if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))

                    return false;

                return x.tiptitle == y.tiptitle;

            }

            public int GetHashCode(TipDetails obj)

            {

                if (obj == null) return ; return obj.tiptitle.GetHashCode();

            }

        }

 result.tipdetails.Distinct(new TipComparer())