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Gridview postback Issues:
After much time and frustration, I’m posting the solution for others struggling with the same scenario…
On pageLoad I was binding the gridview for an initial display of the data. One column had an imagebutton (templatefield). Clicking an ImageButton caused an the error: “Invalid Postback”.
The cause: I had inadvertently failed to put a (! IsPostback) condition in the pageload around the bind. It was causing some sort of double bind when the ImageButton’s click event fired; thus, creating a conflict.