LINQ JOIN: Getting out of memory exception

[Sudip_inn]

see the code below

var QCViewAllHistValue1 = (from frmlst in cfList
join viewalllst in QCViewAllBrokerList1
on new
{
val = String.IsNullOrEmpty(frmlst.Section) ? "" : frmlst.Section.Trim().ToUpper(),
val1 = String.IsNullOrEmpty(frmlst.xFundCode) ? "" : frmlst.xFundCode.Trim().ToUpper(),
val2 = String.IsNullOrEmpty(frmlst.Period) ? "" : frmlst.Period.Replace("A", "").Replace("E", "").Trim().ToUpper(),
val3 = String.IsNullOrEmpty(frmlst.Broker) ? "" : frmlst.Broker.Trim().ToUpper()
}
equals new
{
val = String.IsNullOrEmpty(viewalllst.ViewAllSection) ? "" : viewalllst.ViewAllSection.Trim().ToUpper(),
val1 = String.IsNullOrEmpty(viewalllst.xFundCode) ? "" : viewalllst.xFundCode.Trim().ToUpper(),
val2 = String.IsNullOrEmpty(viewalllst.ViewAllPeriod) ? "" : viewalllst.ViewAllPeriod.Replace("A", "").Replace("E", "").Trim().ToUpper(),
val3 = String.IsNullOrEmpty(viewalllst.ViewAllBroker) ? "" : viewalllst.ViewAllBroker.Trim().ToUpper()
}

select new QCHelper()
{
Value = viewalllst == null ? string.Empty : (viewalllst.Value == null ? string.Empty : viewalllst.Value),
}).ToList<QCHelper>();

cfList & QCViewAllBrokerList1 these are two List<T> type. i am joining these two list and getting out of memory exception

these two list has more than 8,00.000 records may be this huge records causing this issue. my pc is 64 bit and 8GB RAM. i have windows 7 OS installed.

i follow these two links but there suggestion does not work for me.

'System.OutOfMemoryException' was thrown when there is still plenty of memory free

'System.OutOfMemoryException' was thrown when there is still plenty of memory free

please guide me how could i get rid of out of memory exception. thanks

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