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We're a friendly computing community, bustling with knowledgeable members to help solve your tech questions.Please join our friendly community by clicking the button below - it only takes a few seconds and is totally free.Regards, Matt Cor Ligthert [MVP] wrote: In many places in my application, I have a Data Grid View which users can either enter data into or use as a method of navigation in a master/detail form view.I need a method of stopping the user from leaving a row if there is invalid data in it (e.g., a field that cannot be null is). For Data Grid View, it has a Cell Validating and Row Validating events, these 2 event handlers take Data Grid View Cell Validating Event Args/Data Grid View Cell Cancel Event Args type paramters. We can set Cancel property to true to prohibit the user from selecting another row. Hope this helps Best regards, Jeffrey Tan Microsoft Online Partner Support Get Secure!The problem is being unable to cancel the moving from row to row (and, as such, attempting to save the changes).As far as I can tell, the code on your site only helps with validating the data, not stopping the Row Leave event entirely.For instance: I want to check if the First Name field is empty ("") and stop the user from moving if it is.
Because there is no Cancel argument on the parameters for the Row Leave event, I can manage to catch the error and throw up a message, but I am unable to stop it from happening in the first place. Thanks, Matt In many places in my application, I have a Data Grid View which users can either enter data into or use as a method of navigation in a master/detail form view.In your example, you use the Cell Validating event, as shown below: Here, you want to ensure that the length of the new Customer ID is at least five characters.You do this by using the Formatted Value property of the Data Grid View Cell Validating Event Args parameter.Hovering the mouse pointer on the icon displays the Error Text that you set earlier.