Textboxes Not Necessarily Visible On Screen
Sep 23, 2010
I have a web page on which there is a gridview control. The gridview contains the grades (in textbox controls in each row of the gridview) for students and allows entries and updates. The student may eventually end up with 200+ grade records for all the lessons and units in a course. I have quite a few regular users, and only one reports a recurring problem as follows: When they have entered some new grades for a student and saved them, they go back later and find that whole blocks of grades that had been entered prior to the last grade entries have been blanked out.
That is, the grade records still remain, but there are no grades in them (the grades are blank). These textboxes were not necessarily visible on the screen (as the gridview is contained in a panel with scrollbars), but were still populated when the user was entering the other grades. Has anyone heard of any viruses that blank out textboxes in forms that are displayed on a screen? I have checked my code and found nothing that would cause the old values to be blanked out. Moreover, I have other heavy users who do not have this issue.
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