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The Validation controls make use of a Java Script script library that is automatically installed on your server when you install the . Unfortunately, however, it also prevents all the ASP.
NET controls on the page from rendering any non-HTML 3.2 compatible content.
I am using a File Upload control and a Regular Expression Validator to check to make sure the file is a .jpg, .bmp, or extension.
Everything works great, the upload is fine, but the error message posts Jessica Cao Sincerely, Microsoft Online Community Support “Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question.
The current validation group is determined by the control that caused validation to occur.
For example, if a button control with a validation group of are valid.
Here is the article talking the issue and give a solution
This can be beneficial to other community members reading the thread. Fortunately, the Validation controls discussed in this chapter do not force you to make this difficult choice.The Validation controls automatically generate both client-side and server-side code.For this reason, in the past, many developers decided to add all their form validation logic exclusively to server-side code.Because server-side code functions correctly with any browser, this course of action was safer.