Casting int/double to generics?

[THY02K]

I was having problem (see below "TROUBLE") casting int/double to generics ... This is what I intended to write,

public T RecursiveGetNextRandom<T>(T Max, T Min, List<T> lstExcludedNum) 
{
	int nNextNum = 0;
	double dbNextNum  0;
	T NextNum;
	
	nMin = Convert.ToInt32(Min);
	nMax = Convert.ToInt32(Max);
	nNextNum = oRand.Next(nMin, nMax);
	if(Max is double)
	{
		dbNextNum = oRand.NextDouble() * nNextNum;
		NextNum = (T) dbNextNum;			<< TROUBLE: Can't cast to <T>!
	} else if (Max is int) {
		NextNum = (T) nNextNum;				<< TROUBLE: Can't cast to <T>!
	}
	
	return NextNum;
}

I ended up writing the following ugly code:

public static object RecursiveGetNextRandom(object Max, object Min, ArrayList lstExcludedNum) 
{
	object NextNum = 0;
	Random oRand = new Random(Guid.NewGuid().GetHashCode());
	double dbMin;
	double dbMax;
	int nNextNum;

	if (Min == null)
	{
		Min = Int32.MinValue;
	}

	if (Max == null)
	{
		Max = Int32.MaxValue;
	}
	
	if (!(Max is int || Max is double))
	{
		...
	}
	
	dbMin = Convert.ToInt32(Min);
	dbMax = Convert.ToInt32(Max);
	SwapIfGreater(ref dbMin, ref dbMax);
	nNextNum = oRand.Next(Convert.ToInt32(Math.Floor(dbMin)), Convert.ToInt32(Math.Floor(dbMax)));

	if (Max is double)
	{
		NextNum = (double)nNextNum * oRand.NextDouble();
	}
	else if (Max is int)
	{
		NextNum = (int)nNextNum;
	}
	
	if (lstExcludedNum != null)
	{
		if (lstExcludedNum.Contains(NextNum))
		{
			RecursiveGetNextRandom(Max, Min, lstExcludedNum);
		}
	}

	return NextNum;
}

Any suggestion? Thanks!~