Assembly: System.Data (in system.data.dll)
The expression to compute.
The filter to limit the rows that evaluate in the expression.
Return ValueAn Object, set to the result of the computation.
The expression parameter requires an aggregate function. For example, the following is a legal expression:
But this expression is not:
Sum (Quantity * UnitPrice)
If you must perform an operation on two or more columns, you should create a DataColumn, set its Expression property to an appropriate expression, and use an aggregate expression on the resulting column. In that case, given a DataColumn with the name "total", and the Expression property set to this:
"Quantity * UnitPrice"
The expression argument for the Compute method would then be this:
The second parameter, filter, determines which rows are used in the expression. For example, if the table contains a date column named "colDate", you could limit the rows with the following expression:
colDate > 1/1/99 AND colDate < 17/1/99
For rules on creating expressions for both parameters, see the DataColumn.Expression property.
The following example sums the values of a column named "Total", for the salesperson whose identification number is five.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.