I want to add dynamic Computation columns in the grid, refer the attached sample code
in that i want to add a Computation column when the click of "Add Computation Colum 1" that dynamic Computation column should calculate the value of "Price+Qty" when ever the grid got update the calculation value needs to be changed basen on the expression,
also i want to create the amother one dynamic Computation column in the button click of "Add Computation Colum 2" it should calculate the value of "Price-Qty"
all expression are will changed in dynamically or through config file, means "Price+Qty" may change "Price/Qty" also "Price-Qty" may
how can i achive this feature in the grid.
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