there are many ways1. add a new row to your data table, and use DataTable.Compute to do summary2. in DataGrid's ItemDataBound, do the sum yourself and output the sum in a separate row or footer3. see
Summary Rows in DataGrid Controls
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndive/html/data01102002.asp
Summary Rows in DataGrid Controls
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndive/html/data01102002.asp
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