problem in query string for paging

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Hi all
I have a page that loads a lot of data , so I used paging in it.
if I change the index of that paging (like from the first page to the third page)
I reload the page with query string carry that value.
The problem here, there are some cases I use query string and some other no.
In the case I want query sring, there is an error

I tried that but there is an error

NameValueCollection n = Request.QueryString;
if (n.HasKeys())
{
    // Get first key and value
    string Current = n.Get(0);
    // Test different keys
    if (Current == "page")
    {
        if ((Request.QueryString["page"].ToString().Trim() != string.Empty))
        {
           CurrentPage = Convert.ToInt16(Request.QueryString["page"]);
           fill_Account();
        }

any help,
thanks

[edit]inline code converted to code block (It preserves the formatting), capitalization, removed spurious "iii" - OriginalGriff[/edit]

Posted 8-Feb-11 0:18am

moon2011

Updated 8-Feb-11 0:30am

OriginalGriff

v3

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moon2011 8-Feb-11 6:28am

thanks for your reply, but it still appears an exception
"Object reference not set to an instance of an object."

Umair Feroze 8-Feb-11 6:32am

Please use the code provided in the answer. It is working fine.

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Umair Feroze · Answer 1 · 2011-02-08T00:31:00

I believe the following code will work for you:

if (Request.QueryString["page"] != null && !String.IsNullOrEmpty(Request.QueryString["page"].ToString().Trim())){
    CurrentPage = Convert.ToInt16(Request.QueryString["page"]);
    fill_Account();
}

This will verify if you have the key Page in the query string and its value is not empty or null. If these conditions match it will proceed with the functionality you need.