Simple heap implementation in C#

I recently needed a simple priority queue in C# and was surprised to find that there is neither anything called "priority queue" nor "min heap" or "max heap" in .NET (or at least I did not find it when I looked). Here is a textbook-like implementation I came up with:

class MinHeap<T> where T : IComparable
{
    private List<T> data = new List<T>();

    public void Insert(T o)
    {
        data.Add(o);

        int i = data.Count - 1;
        while (i > 0)
        {
            int j = (i + 1) / 2 - 1;

            // Check if the invariant holds for the element in data[i]
            T v = data[j];
            if (v.CompareTo(data[i]) < 0 || v.CompareTo(data[i]) == 0)
            {
                break;
            }

            // Swap the elements
            T tmp = data[i];
            data[i] = data[j];
            data[j] = tmp;

            i = j;
        }
    }

    public T ExtractMin()
    {
        if (data.Count < 0)
        {
            throw new ArgumentOutOfRangeException();
        }

        T min = data[0];
        data[0] = data[data.Count - 1];
        data.RemoveAt(data.Count - 1);
        this.MinHeapify(0);
        return min;
    }

    public T Peek()
    {
        return data[0];
    }

    public int Count
    {
        get { return data.Count; }
    }

    private void MinHeapify(int i)
    {
        int smallest;
        int l = 2 * (i + 1) - 1;
        int r = 2 * (i + 1) - 1 + 1;

        if (l < data.Count && (data[l].CompareTo(data[i]) < 0))
        {
            smallest = l;
        }
        else
        {
            smallest = i;
        }

        if (r < data.Count && (data[r].CompareTo(data[smallest]) < 0))
        {
            smallest = r;
        }

        if (smallest != i)
        {
            T tmp = data[i];
            data[i] = data[smallest];
            data[smallest] = tmp;
            this.MinHeapify(smallest);
        }
    }
}