Sorting a list of objects of multiple data types

I have this class in my code

class Stock
{
    public DateTime Date;
    public string Day;
    public double Open, Close, Diff;
    public int Volume;

    public Stock(double open, double close, double diff, int volume, string day, DateTime date)
    {
        this.Open = open;
        this.Close = close;
        this.Diff = diff;
        this.Volume = volume;
        this.Day = day;
        this.Date = date;
    }
}

In another class i want to create a bubble sort that will sort a List of Stocks (List<Stocks>) passed to it, i am having multiple issues with this the main problem is the data types, its not easy comparing two values when they could be a string, int, double or DateTime. I have done it with a method that uses TryParse to check for valid data type, but im looking for a nice clean solution, this is my attempt so far

public void BubblesortBy(int sortBy, List<Stock> Stocks)
{

    Type objType = typeof(Stock);
    FieldInfo[] fields = objType.GetFields();

    Stock temp = null;
    int loopCount = 0;
    bool doBreak = true;

    for (int i = 0; i < Stocks.Count; i++)
    {
        doBreak = true;
        for (int j = 0; j < Stocks.Count - 1; j++)
        {
            if (Compare(fields[sortBy - 1].FieldType.ToString(), fields[sortBy].GetValue(Stocks[j]), fields[sortBy].GetValue(Stocks[j+1])))
            {
                temp = Stocks[sortBy + 1];
                Stocks[sortBy + 1] = Stocks[sortBy];
                Stocks[sortBy] = temp;
                doBreak = false;
            }
            loopCount++;
        }
        if (doBreak) { break; /*early escape*/ }
    }
}

The int passed to it determines whether to sort by, which is why i am using reflection so the variables are accessible by numbers.

1. Date


2. Day


3. Open


4. Close


5. Difference


6. Volume