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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 a request to the server, then you should set the needValidateall variable inside the acwmain.js to true.
The following screenshot displays the needValidateall variable in acwmain.js. Please set it to true, and now GridWeb will validate the entire worksheet, not just the updated cells.

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