class Dictionary in c#

Hi, I'm programming in C #, and I have a question about the class dictionary, I know that this work as a hash table, but I would like to know how that hash function uses (or which is the one that could use), and that size is its table, here is an example of Dictionary, and here is my question.

private static Dictionary<string, double> PrepareFrequency(string[] words)
{
    Dictionary<string, double> table = new Dictionary<string, double>();

    foreach (string word in words)
    {
        if (table.ContainsKey(word))
            table[word]++;
        else
            table.Add(word, 1);
    }

    return table;
} 

Code (markup):

Thanks for your attention.