Cannot Use SumFunction in Grid View

[Kelvin Kwok]

Dear Telerik Team

I am currently facing a problem using SumFunction in Grid View, I can use Count, Max, Min  Functions except Sum and Average.
When I am using SumFuntion, it return an error with Type 'System.Linq.Enumerable' there is no generic method 'Sum'. 

I am using the code behind to do so, which you could see as below.

Dim group_constraint As New GroupDescriptor()
group_constraint.Member = "DELDATE"
group_constraint.SortDirection = ListSortDirection.Descending
group_constraint.DisplayContent = "DELDATE Group"

Dim c As New SumFunction
c.SourceField = "QTY"
c.Caption = "Total Count: "
group_constraint.AggregateFunctions.Add(c)
Me.dgProductionPlan.GroupDescriptors.Add(group_constraint)

In addition, my data grid, data source is from WCF, which WCF using LINQ to SQL to retrieve data from database.

Looking Forward your reply, ASAP!
Thank you

[Vlad]

Hi,

 Can you post more info about this property data type (DELDATE)? If this is not numeric type you will unable to use these functions. 

Greetings,
Vlad
the Telerik team

[Kelvin Kwok]

Dear Telerik Team

Thank you for your prompt reply.
I have solved the same already.

[Mark]

It would be great if we could use these functions on type 'money'.