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By default, GridWeb validates only the updated cells and does not validate the entire worksheet. However, if you want to validate the entire worksheet on the client side before GridWeb posts the request to the server, you should set the needValidateall variable inside acwmain.js to true.
The following screenshot shows the needValidateall variable in acwmain.js. Please set it to true, and GridWeb will now validate your entire worksheet, not just the updated cells.

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