data tabel compute problems ofter filtering

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1.00/5 (1 vote)

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i have datatable that contain one int column
like name, surname, age(int)
now i filtering the using linq and assing all filter date to datatable
now i want to make sum of age
it will ginving error like Invalid usage of aggregate function Sum() and Type: String

ex:

C#

dttemp = dtItemsQty.AsEnumerable().Where(a => Convert.ToString(a["age"]) == lblage.Text ).CopyToDataTable();
string Total = Convert.ToString(dttemp.Compute("SUM(age)", String.Empty));

Posted 10-Feb-13 23:57pm

madhu.gone

Updated 11-Feb-13 0:20am

_Amy

v3

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_Amy · Answer 1 · 2013-02-11T00:18:00

Solution 1

Try this:

C#

if(dttemp!=null){
   var sum = dttemp.AsEnumerable().Sum(dr => dr.Field<int>("age"));
   Label1.Text = sum.ToString();</int>
}

OR
object sum;

C#

if(dttemp!=null){
   sum= dttemp.Compute("Sum(age)", "");
   Label1.Text = sum.ToString();

}

--Amit

Posted 11-Feb-13 0:18am

_Amy

Updated 11-Feb-13 0:19am

v2

Comments

madhu.gone 11-Feb-13 6:24am

No Above Two Are Not working for me

Ofter filtering age column was in string datatype

_Amy 11-Feb-13 6:25am

Check for the count/values in dttemp. I think the table dttemp doesn't contains any data.

madhu.gone 11-Feb-13 6:27am

its having string datatype

_Amy 11-Feb-13 6:28am

Then change the type string to int in linq query.

madhu.gone 11-Feb-13 8:14am

yes i just made that only