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c# QueryString how to send data from one webpage to another?

I wanted to ask a little complicated question for me. I want to make a simple program like I have website www.example1.com and there would be a simple panel to enter your name and your country. After that you have to click "send" and it will give you a request number like 12345. The data entered on that panel will be sent to the another site at wwww.example2.com . And I will check the data given from example1 to example2 (like: name: John , country : Jamaica , request number :12345) . I found on internet something like querystring at c# but im not sure what to do. I demand your help , best regards.

Yes this is possible you could navigate the browser from site www.example1.com to www.example2.com/someAction?name=joe for example. However, in order to validate against this you would need some sort of server in which example1 would have to send the data first and store it. This would then allow example2 to call that service checking the data it got via query params was valid. This is a very long winded way to pass data about not sure it is a good solution.

How to get part of a link and input it into website with javascript

So I'm trying to make a website where you put in a username and it will give you data about that username using an API. Right now I have it set up so you have to type the username in every time you're on the website, but I was wondering if it's possible to put the username in the link and still be able to retrieve it to put it into an API and use the API's response in the website?
For example, would it be possible to have something like http://website.com/?username=XXXXXXXXXand to be able to get the part after ?username= and to save it to a string or something to put into the API using JavaScript or jQuery? Any help would be appreciated :)

why don't you saving username in cookie/storage/session after user input?your ways is complex and unreliable.or may be you could use the rest url format like this: http://{username}.example.com/api or http://www.example.com/{user}/api then your backend always retrieves username from this path and you needn't add parameters manually.

How can I make a search box to search in a local database?

I'm playing around with Apache Cordova and I want to implement a search box that can search in a list or something similar (local database?). I want it to be local so that the app does not require an internet connection to search.
The way I want it to be set up is that it need to be able to search for both the name of the item and a number.
Example 1:
A user searches for: "Honda". He will then be sent to a page where information about "Honda" will be diplayed.
Example 2:
A user searches for the id: "1337". He will then be sent to the page containing information about "Honda".
So "Honda = 1337" and "1337 = Honda" if you guys understand?
The question:
I'm wondering what solution would suite my needs for this project?
or there any frameworks out there for this?
Thanks in advance!

It depends on what you want to have the search box and submit to be like.
One way is to use this really great tool http://ivaynberg.github.io/select2/ it can load data from database (using either ajax or load all of your data and only filter them) and shows them in selectbox. You can have submit button or something like that next to your selectbox.
Other way might be to use http://www.datatables.net/ it has search box, which can load data to table using ajax where you can have additional information and submit button for sending user to specific page.
There is plenty of other tools for this kind of problem, I used these two and I can say

Use Python to return data from a Webpage's Ajax call

I'm writing a program in Python that needs to use a site's advanced search options. Specifically, the search page is the NVC advanced search page . I know the names of the projects and versions I need to search for, so ideally the program would select the project names and versions numbers from the dropdown lists, then return the results page(s).
I'm totally unfamiliar with HTML and Javascript, and I'm fairly new to Python, so I don't know if there's a way to 'click' these dropdown menus via Python, then return the results. The fact that the Javascript makes an Ajax call further complicates the situation, since I can't just load the page's source and parse out the list of project names and version.
Can anyone with some Python/Javascript/Ajax experience send me in the right direction?
An example use of this program would be that I start out with the project "glibc' and its version number '2.3.6' The program would make sure that this combination is listed at all (which isn't guaranteed), then return the results page (which has about 13 results).

The Mechanize Python library is perfect for form automation. There is an example of how to edit and submit forms on the examples page.

If a human user is using that search page, they click on one of the product links, which then load the list of products from another page, e.g.:
http://web.nvd.nist.gov/view/vuln/cpe/cpe-chooser?index=0&component=Vendor
This page is unfortunately not using JSON, so they have some custom javascript parsing for the response. The data from this response is then displayed as a drop-down for the user. When the user selects a product, the browser selects the correct value, so that when the form is submitted, it will be part of the query. e.g.:
http://web.nvd.nist.gov/view/vuln/search-results?adv_search=true&cves=on&cpe_vendor=cpe%3A%2F%3Aa-a-s_application_access_server
In this, cpe_vendor=cpe%3A%2F%3Aa-a-s_application_access_server is the important part. The part before the = sign is the field name, the part after is the selected value (which originally came from the ajax request). The funny %3A bits are URL-encoding.
So you don't actually need to interact with the page, since you know the names of the vendors and products for which you want to search; you just need to look up the field name (cpe_vendor for vendors) and the value for the specific products/vendors (cpe:/:a-a-s_application_access_server for my example above), then do a request to the normal search URL.

The advanced search options page sends the options via GET to the results page, giving you the URL (linebreaks mine to make it clearer):
http://web.nvd.nist.gov/view/vuln/search-results?
adv_search=true&
cves=on&
cve_id=&
query=&
cwe_id=&
cpe_vendor=cpe%3A%2F%3Aian_bezanson&
cpe_product=cpe%3A%2Fa%3Aian_bezanson%3Adropbox&
cpe_version=cpe%3A%2Fa%3Aian_bezanson%3Adropbox%3A0.0.3_beta&
pub_date_start_month=0&
pub_date_start_year=2005&
pub_date_end_month=2&
pub_date_end_year=2009&
mod_date_start_month=2&
mod_date_start_year=2007&
mod_date_end_month=9&
mod_date_end_year=2009&
cvss_sev_base=&cvss_av=&
cvss_ac=&
cvss_au=&
cvss_c=&
cvss_i=&
cvss_a=
It would then take a bit of sleuthing to figure out what bit of the url is what information from the form but that should let you then just scrape the results page.

Drop down Selection -> Search database

How would I search an SQL database when a user makes a selection in a dropdown list. I know how to change/add text to areas using some javascript but not with a SQL search as well.
Ideally I don't want to be changing pages in this process as I'm thinking they won't be sticking on a single option in the drop down for long.
Cheers in advance. =)

You have to add an onchange event listener to the dropdown box. When the user selects an option, an AJAX (XmlHttpRequest) should be send to the server. A serverside script, a PHP page for example, should parse the parameters (after checking).
When these parameters have been checked, they should be escaped for this reason. Perform a search query, parse the results, and send the output back to the client (the user, browser).
Useful links:
http://www.php.net/manual/en/ref.mysql.php
https://developer.mozilla.org/en/xmlhttprequest

you should look into implementing Ajax for this.
Here's a simple example and tutorial utilizing a drop down list that fetches information from a database on selection, without changing pages :)
http://www.w3schools.com/php/php_ajax_database.asp
You should also look into using jquery for your Ajax requests as stated in the answer below. (Do more with less code).
See also:
http://15daysofjquery.com/quick-and-dirty-ajax/14/ for a simple jquery Ajax tutorial.

Before you render the page, make sure you do a grab the info you want presented from the database.
select distinct NAME, ID
from tableName
You can use the information obtained here to generate the html for a drop down box. Include something to the effect
<select onchange="doAction(this.value);">
<option value="userID">userName</option>
<option value="userID">userName</option>
<option value="userID">userName</option>
...
</select>
Then perform an AJAX request back to your site. Get your information from your second query to the database, and return with the information you need. When you perform your second query (and in general) you have to protect yourself against injection attack vectors. The best start for this is to make sure you have encoded(HTML, SQL) correctly.

Without more information I can only really give you the below as a guide. It uses the jQuery load function to put the contents of one page into an element. Note that .load cannot be used across domains.
$("#searchButton").live("click", function() {
$("#results").load("/SearchResults.php?s=" + $("#searchBox").val());
});
Also note that you should use something to filter out HTML tags to prevent SQL injection, as well as taking other measures.