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Most Web Developers have come across this problem at one time or another, how do I stop someone navigating away from a page if they have not saved any changes they have made?The answer is that you need to employ ‘Dirty Checking’, basically set a flag when the page data is changed and check it if the user tries to navigate away.
When I do an update, and get to the Grid View1_Row Updating, there is no value passed to "ID", and then when I go to the next row for "Company" I get the following error: Specified argument was out of the range of valid values. So now we could flag a page as being in Edit Mode and bail out of check Exit if it was (even if the apge was flagged as being dirty).But we were not out of the wood quite yet – we still needed to wire the new functions into the rest of the code.update the Grid View but not call the Update method of it’s Data Source until the whole page was being committed.
I had to wire up the dirty checking to flag any changes made to the data it contained.Six of those paramaters basically comes from the Text Box values that were entered in the page. Invalid Cast Exception: Unable to cast object of type 'System. The last parameter is a boolean value which tells the method whether to execute an Insert (false) or Update (true). In-order to perform Edit and Update in Grid View we need to use three events ( Grid View_Row Editing, Grid View_Row Canceling Edit , Grid View_Row Updating). This way we could ignore Postbacks that occured when the Grid View entered Edit Mode – simple…..