i am using telerik silverlight chart.i got exception "No generic method 'Average' on type 'System.Linq.Enumerable' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic" when tried to bind list to chart.
When I use very small data it works fine. But for large number of records I get following error.
RadChart1.ItemsSource = lst1;
i also tried with changes suggested in the forums:
ItemMapping mapping = new ItemMapping("Sales", DataPointMember.YValue, ChartAggregateFunction.Sum);
mapping.FieldType = typeof(double)
but with no luck.
and i also noticed one thing that exception is occurring when result set is reaches more than 200