设置默认的.aspx页面访问权限？

Question

Sorry for some ambiguous title. I'll try best to explain in detail.

So I'm making page in board to move through from the first page to the next, by using <a href> tag in front side, List.aspx

the part of code looks like below.

<% 
    for (int x = 1; x < page_count + 1; x++)
    {  
%>
        <a name="page_index" href="List.aspx?page=<%=x %>"><%=x %></a>

<% } %>

So by using GET method, I move the page info to back side, List.aspx.cs and here, works with query sentence, calling 10 records from my MSSQL DB

page_number = Request.QueryString["page"];

        int_page_number = Convert.ToInt32(page_number);
        string sql = ""; //sql query

        CDatabase _db = new CDatabase();
        sql = "SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY ArticleIdx) AS orderednumber,";
        string tail = "ArticleIdx, writerName, passwords, title, content, writeDate From dbo.article) AS ordering WHERE orderednumber BETWEEN " +(10*(int_page_number-1)+1).ToString() + " AND " + (10*int_page_number).ToString();
        sql = sql + tail;

However, the problem is since I set up as default page List.aspx if I just enter through my local server, in List.aspx page there appears nothing in my board. If I click number 1 href tag below, then it moves to List.aspx?page=1 and show 10 contents.

How can I connect default List.aspx page to page=1?

Answer 1

Just check if the querystring exists first, if it doesn't, set page number to 1 before the rest of your code runs

If (Request.QueryString["page"] == "") {
    page_number = 1;
}
else {
    page_number = Request.QueryString["page"];
}

edit: could even do this if you wish

page_number = Request.QueryString["page"];
if (page_number == "") page_number = 1

Answer 2

Going above and beyond

//Set a default
int int_page_number = 1;

//Check there is a value in the query string for page
if(!String.IsNullOrEmpty(Request.QueryString["page"]))
{
     //Try to parse the query string value to an integer
     if(! int.TryParse(Request.QueryString["page"] , out int_page_number))
     {
         //Revert back to 1 if it fails
         int_page_number = 1;
     }
}

This also ensures page number is numeric.