void Resize()
{
var prime = HashHelpers.GetPrime(count * 2);
var newBuckets = new int[prime];
for (var i = 0; i < newBuckets.Length; i++)
newBuckets[i] = -1;
var newEntries = new Entry[prime];
Array.Copy(entries, 0, newEntries, 0, count);
for (var i = 0; i < count; i++)
{
var modHashCode = newEntries[i].HashCode % prime;
newEntries[i].Next = newBuckets[modHashCode];
newBuckets[modHashCode] = i;
}
buckets = newBuckets;
entries = newEntries;
}