Using LINQ Query to Filter but it is selecting the particular Key Numerous times

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C#

Hi all i am trying to Query from a table (_dtlayout) using the LINQ to SQL. I am trying to select a column name FK_DataPoint.
But when i Debug it out it is hitting that column numerous times. It does not throw any ERROR but for Performance wise it is a major issue. I know i am using a Where clause which goes to each rows and filters it. But is there a better way to put this code together in order to filter this DATAPOINT Column. Thank you .

int? dataPointKey = _dtLayout.AsEnumerable().
    Where(row => row.Field<int?>("FK_FinancialStatementTemplateSectionItem") 
== colDef.FK_FinancialStatementTemplateSectionItem 
&& row.Field<int?>("RowNumber") == columnItem.RowNumber
&& row.Field<int?>("ColumnNumber") == colDef.ColumnNumber
&& row.Field<int?>("ItemNumber") == columnItem.ItemNumber)                                
.Select (row =>row.Field<int?>("FK_DataPoint")).FirstOrDefault();

Thanks