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Object Reference Not Set to an Instance of an Object

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August 2009 Entries

A few days ago I got an error report to fix. Some web application that I now maintain was inserting duplicate records. After a quick look it became obvious that the users where double clicking the submit button and that made the page post twice and so a duplicate record would appear. A quick fix dor this problem using javascript: <script language="javascript" type="text/javascript"> var haveSubmitted=false; function FirstSubmitOnly() { if (haveSubmitted) return false; haveSubmitted = true; ......