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Generic IEquatable

using System; using System.Collections.Generic; using System.ComponentModel;     public sealed class Pair<TFirst, TSecond>: IEquatable<Pair<TFirst, TSecond>>{         private readonly TFirst first;         private readonly TSecond second;         public Pair(TFirst first, TSecond second)         {             this.first = first;             this.second = second;         }         public TFirst First         {             get { return first; }         }         public TSecond Second         {             get { return second; }         }         public bool Equals(Pair<TFirst, TSecond> other)         {             if (other == null)             {                 return false;             }             return EqualityComparer<TFirst>.Default.Equals(this.First, other.First) &&                    EqualityComparer<TSecond>.Default.Equals(this.Second, other.Second);         }         public override bool Equals(object o)         {             return Equals(o as Pair<TFirst, TSecond>);         }         public override int GetHashCode()         {             return EqualityComparer<TFirst>.Default.GetHashCode(first) * 37 +                    EqualityComparer<TSecond>.Default.GetHashCode(second);         }     }