Hello, 

I am somewhat still new to WPF, and I am inquiring about completing a custom summary in a xamDataGrid which contains 3 columns, A (quantity), B (Cost), C(List Price).  

My goal is to multiply A * B, and have the calculation summary for column B reflect at the bottom in the Summary Definition, and do the same by multiplying A * C, and also have that summary reflected at the bottom in the summary definition for column C. 

Below is what I have so far. 

public class DataGridCustomSummary : SummaryCalculator
{

private int _numTickets;
private decimal _cost;
private decimal _listPrice;
private decimal _costTotal;
private decimal _listPriceTotal;

public override void BeginCalculation(SummaryResult summaryResult)
{

_numTickets = 0;
_listPrice = 0;
_cost = 0;

}

public override bool CanProcessDataType(Type dataType)
{
return Utilities.IsNumericType(dataType);
}

public override void Aggregate(object dataValue, SummaryResult summaryResult, Record record)
{
decimal myCellValue = decimal.Parse(dataValue.ToString());
DataRecord myCurrentRecord = record as DataRecord;

if (myCellValue > _costTotal)
{

_costTotal = _numTickets * _cost;
_listPrice = _numTickets * _listPrice;
_costTotal = myCellValue;
_listPriceTotal = myCellValue;

}
}

public override object EndCalculation(SummaryResult summaryResult)
{
return _costTotal;
}

public override string Name
{
get { return "Cost Total"; }
}

public override string Description
{
get
{
return "Cost Total";
}
}
}

Thanks in advance for your assistance!