ASP.NET ListView Paging : Invalid viewstate - asp.net

Question

I have a ListView control as follows (for posting here I've removed the values from my ItemTemplate):
<asp:ListView ID="ListView1" runat="server" DataSourceID="MyDataSource">
<LayoutTemplate>
<div id="requests" runat="server">
<asp:Panel runat="server" id="itemPlaceholder"></asp:Panel>
</div>
<asp:DataPager runat="server" ID="DataPager" PageSize="3">
<Fields>
<asp:NumericPagerField ButtonCount="10" PreviousPageText="<--" NextPageText="-->" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<div ID="itemPlaceholder" class="request" runat="server">
<asp:LinkButton ID="button" runat="server" Text='...' CommandName="..."
CommandArgument='...' OnClick="..."
style="...">
</asp:LinkButton> -
</div>
</ItemTemplate>
</asp:ListView>
This ListView exists as a user control (.ascx), which I've embedded into an ASPX web page.
As I expect, when the web page loads, for a list of 9 items, I get 3 pages of 3 items.
When I click to go to the next page, the page loads the next set of items correctly... but only for a brief second. Then a strange thing happens. The page embeds a copy of itself inside the page 6 times, each one of them underneath one of the fields on the form inside the page.
If I then attempt to go to the next or previous page, an ASP.NET server error appears:
The state information is invalid for this page and might be corrupted.
In the stack trace, it shows the following errors:
FormatException: The input is not a valid Base-64 string as it contains a non-base character, more than two padding characters, or a non-white space character among the padding characters.
ViewStateException: Invalid viewstate.
I was able to replicate this on both my browsers, IE8 and Chrome.

Answer 1

you use listview event OnPagePropertiesChanging
like this
<asp:ListView ID="lvCustomers" runat="server" GroupPlaceholderID="groupPlaceHolder1"
ItemPlaceholderID="itemPlaceHolder1" OnPagePropertiesChanging="OnPagePropertiesChanging">
in aspx.cs
protected void OnPagePropertiesChanging(object sender,PagePropertiesChangingEventArgs e)
{
(lvCustomers.FindControl("DataPager1") as DataPager).SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
this.BindListView();
}
BindListView() is method for binding list view
visit this link for example
i hope it's helpfull