can't see Page2,3,.. when i set GridView paging to true

[test12345]

I set \[code\]AllowPaging\[/code\] of Gridview to True,when records more than one page i can see page's number (1,2,..) but when i click on number can't see other pages (Page2,3 ,...) and page doesn't changei use \[code\]DataBind()\[/code\] in \[code\]PageIndexChanging\[/code\] event but when i click on number i can't see GridView