Questions tagged [event-validation]

I have a grid view with check boxes in a template field that are used to delete one or more rows at a time. I then have a button that posts back to the server and deletes any row with a checked checkbox. That works fine. I recently added a button…

This question seems to have been asked before, but I feel like my situation is slightly different. I have a page that contains a gridview. When a button is pressed to edit one of the records in the gridview, the button first executes some client…

We have a textbox inside an update panel and it postsback on text change. Around 1 in 1000 POST request to server is missing the __EventValidation form element ( we verified using the logs that, when this exception occured the request was missing…

I have a repeater which nests one or more custom control instances. Each custom control instance has a drop down and a button called "Update". This all works fine when JS is on. However with JS off, I get the "Invalid postback or callback…