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Simply it's gridview1.PageCount-1. And I found the problem is at the Page_Load event and Page_SaveStateComplete event. gridview1.PageCount always returns 0 in Page_Load event and it returns a number &gt;= 0 in Page_SaveStateComplete event. That's why I always get a error.
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Simply it's gridview1.PageCount-1. And I found the problem is at the Page_Load event and Page_SaveStateComplete event. gridview1.PageCount always returns 0 in Page_Load event and it returns a number >= 0 in Page_SaveStateComplete event. That's why I always get a error.

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Thanks. It looks simple.
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How to know the pageindex of the last page of a gridview

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