I use querystring to retrieve parameters send from another form, let's say that you are and index.html and there is a link url to default.aspx like this
~/Default.aspx?var=hello

then and the Server code from Default.aspx to retrieve that value i have this.

string stTest = Request.QueryString["var"];

now stTest is equal to "hello"
hope that help you

Its handy if you want to pass data to other pages, especially when you want it retained in the browser's history. If you POST search terms to google for example then you wouldn't have a list of all searches you performed in your browser history.

It comes from the days of ASP.

The "Request.QueryString" command is used to collect values in a form with method="get".

SimpleForm_1.asp

<form method="get" action="SimpleFormHandler_1.asp">
    <TEXTAREA NAME="location" COLS=33 ROWS=4></TEXTAREA>
    <input type='submit' value='Add Event'>
</form>

SimpleFormHandler_1.asp

<%@ Language=VBScript %>

<%
        Dim userLocation

        'location is the variable name as defined by "NAME="
        'in SimpleForm_1.asp
        userLocation = Request.QueryString("location")
%>

The "Request.Form" command is used to collect values in a form with method="post".

SimpleForm_2.asp

<form method="post" action="SimpleFormHandler_2.asp">
    <TEXTAREA NAME="location" COLS=33 ROWS=4></TEXTAREA>
    <input type='submit' value='Add Event'>
</form>

SimpleFormHandler_2.asp

<%@ Language=VBScript %>

<%
        Dim userLocation

        'location is the variable name as defined by "NAME="
        'in SimpleForm_2.asp
        userLocation = Request.form("location")
%>

See http://www.w3schools.com/ASP/asp_inputforms.asp

You'll probably find more info on it if you search for "ASP Request.QueryString" and "ASP Request.Form".

C#

string userLocation;
userLocation = Request.QueryString["location"];

C#

string userLocation;
userLocation = Request.Form["location"];

this thread must be moved to ASP.NET forum.

I flagged it for you. The button should be located under the reply:

sknake Online Posting Virtuoso Re: QueryString #9 1 Minute Ago | Add to sknake's Reputation | Flag Bad Post

Do you not want to get the entire page?

namespace daniweb.web
{
  public partial class Cb : System.Web.UI.Page
  {
    protected override void OnInit(EventArgs e)
    {
      base.OnInit(e);
      if (Request.QueryString["parm"] != null)
      {
        Response.Write("You entered the value: " + Request.QueryString["parm"]);
        Response.Flush();
        Response.Close();
      }
    }

URL: http://localhost:14332/Cb.aspx?parm=hello

Result:

You entered the value: hello

Explain what you are trying to do first.

>>. At this point I get the entire code of my page! Not good, anyone got an idea about what's wrong? Here is my code:

From what you said I was guessing that when you entered a query string you didn't want to render the page, but rather wanted to only render something custom. Please clarify what you are trying to do

MVC uses URL rewriting to mask the query string. Daniweb uses URL rewriting too. By default vBulleting's urls look like

http://www.daniweb.com/forums/viewThread.php?id= 214743&page=2

Notice how Dani made them look. This helps search engines index your pages better: http://www.daniweb.com/forums/thread 214743-2.html

Anyway you don't need to send the URL with your button. The button causes a post back and you can get the current URL with Request.Url

I have no idea what you're doing -- so I don't know what you're doing wrong.

Explain what you are trying to do first.

>>. At this point I get the entire code of my page! Not good, anyone got an idea about what's wrong? Here is my code:

From what you said I was guessing that when you entered a query string you didn't want to render the page, but rather wanted to only render something custom. Please clarify what you are trying to do