ASPxGridView - How to calculate column values on the client side via editors inside DataItemTemplate

This example demonstrates how to calculate column values on the client side via editors inside DataItemTemplate and submit the changes to a datasource.

1) Define ASPxSpinEdit editors inside the "Unit Price" and "Units In Stock" column DataItemTemplate and bind the editors with corresponding column values;
2) Define both an unbound column and ASPxTextBox editors inside its DataItemTemplate to display the results of the calculation;
3) Handle the ASPxGridView.CustomUnboundColumnData event to populate unbound column values;
4) Handle the client-side NumberChanged event of template ASPxSpinEdit and calculate a resultant total value for a corresponding DataRow;
5) Track all the modifications via the ASPxHiddenField control;
6) Perform a postback to the server and submit all the changes to the datasource: retrieve the changes from the ASPxHiddenField control.

See Also:
E2961: How to sum values of bound and unbound columns and calculate a total value on the client side