simple array based hash table implementation

program.cs

using System;

unsafe class Program
{
    static KeyValue[] hashTable = new KeyValue[10];

    static int Hash(string key, int count)
    {
        int total = 0;
        fixed (char* pbegin = key)
        {
            char* p = pbegin;
            while (*p != '\0')
            {
                total += (byte)*p;
                p++;
            }
        }
        return total % count;
    }
    
    unsafe static int djb2Hash(string key, int count)
    {
        int hash = 5381;
        fixed (char* pbegin = key)
        {
            char* p = pbegin;
            while (*p != '\0')
            {
                hash = ((hash << 5) + hash) + (byte)*p;
                p++;
            }
        }
        return hash % count;
    }

    class KeyValue
    {
        public KeyValue Next { get; set; }
        public string Key { get; set; }
        public string Value { get; set; }
    }

    static void Add(KeyValue newKeyValue)
    {
        int index = Hash(newKeyValue.Key, hashTable.Length);
        newKeyValue.Next = hashTable[index];
        hashTable[index] = newKeyValue;
    }

    static KeyValue FindByKey(string key)
    {
        int index = Hash(key, hashTable.Length);
        KeyValue keyValue = hashTable[index];
        while (keyValue != null)
        {
            if (keyValue.Key == key)
                return keyValue; 
            keyValue = keyValue.Next;
        }
        return keyValue;
    }

    static void Main(string[] args)
    {
        Add(new KeyValue() { Key = "01", Value = "Adana" });     // collision 
        Add(new KeyValue() { Key = "10", Value = "Balıkesir" }); // collision

        Add(new KeyValue() { Key = "06", Value = "Ankara" });   // collision 
        Add(new KeyValue() { Key = "60", Value = "Tokat" });    // collision 

        Add(new KeyValue() { Key = "34", Value = "İstanbul" });
        Add(new KeyValue() { Key = "35", Value = "İzmir" });


        KeyValue keyValue = FindByKey("01");
        if (keyValue != null)
            Console.WriteLine(keyValue.Key + ":" + keyValue.Value);
        else
            Console.WriteLine("Key Bulunamadı.");
       
        Console.ReadKey();
    }
}