How to use PLINQ to update datatable

[Sudip_inn]

suppose this way i am updating my datatable

dtFilterDataFromAllData.AsEnumerable()
.Where(a => a.Field<string>("TabName") == TabName
&& a.Field<string>("StandardLineItem") == StandardLineItem
&& a.Field<bool>("cumulative").ToString().ToUpper() == "TRUE"
&& a.Field<string>("StandardDate") == StandardDate.Replace("1Q", "2Q")).ToList<DataRow>()
.ForEach(y =>
{
y["StandardValue"] = dblcumulativeValue;
});
dtFilterDataFromAllData.AcceptChanges();


in above code if i use AsParallel then getting exception. may be encounter this exception

Collection was modified. enumeration operation might not execute



so how to use PLINQ during updation of datatable.

please help me with sample code using PLINQ for update. thanks

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