public static T2 GetValueAtKey <T1, T2>(this IDictionary <T1, T2> originalDictionary, T1 key)
{
if (key != null)
{
if (originalDictionary.ContainsKey(key))
{
return(originalDictionary.FirstOrDefault(x => x.Key.Equals(key)).Value);
}
else
{
throw new KeyNotFoundException();
}
}
else
{
throw new ArgumentNullException();
}
}