Tag Archives: web

Graph currency rates over time in C#

Posted on December 2, 2016 by RodStephens

This example, which shows how to graph currency rates for a specific currency, is a bit longish. Sorry about that. It uses Yahoo Query Language (YQL), which you can use to perform a wide variety of queries on Yahoo’s data. … Continue reading →

Posted in finance, internet, mathematics, web | Tagged C#, C# programming, currency conversion rates, currency exchange rates, currency prices, example, example program, finance, get currency conversion rates, get currency exchange rates, get currency prices, get stock prices, get stocks, graph currency conversion rates, graph currency exchange rates, graph currency prices, graph currency rates, internet, mathematics, stock prices, stocks, web, WebClient, Windows Forms programming | 3 Comments

Get currency exchange rates in C#

Posted on December 2, 2016 by RodStephens

This example shows how you can get currency exchange rates from finance.yahoo.com. When it starts, the program uses the following code to get the currency exchange rates. // Get the currency symbols. private void Form1_Load(object sender, EventArgs e) { string … Continue reading →

Posted in finance, internet, mathematics, web | Tagged C#, C# programming, currency conversion rates, currency exchange rates, currency prices, example, example program, finance, get currency conversion rates, get currency exchange rates, get currency prices, get stock prices, get stocks, internet, mathematics, stock prices, stocks, web, WebClient, Windows Forms programming | 3 Comments

Get stock prices from different exchanges in C#

Posted on December 1, 2016 by RodStephens

The example Get stock prices from the internet in C# shows how to download stock prices from download.finance.yahoo.com. It builds a URL of the following form to get prices for MCI, DIS, COKE, and PEP: http://download.finance.yahoo.com/d/quotes.csv?s=MCI+DIS+COKE+PEP&f=sl1d1t1c1 To get prices from … Continue reading →

Posted in finance, internet, mathematics, web | Tagged C#, C# programming, example, example program, finance, get stock prices, get stocks, internet, mathematics, stock prices, stocks, web, WebClient, Windows Forms programming | 1 Comment

Make a temperature forecast in C#

Posted on May 18, 2016 by RodStephens

The example Get weather forecast data in C# explains how to read weather forecast data from OpenWeatherMap. This example uses that data to list the forecast’s temperatures. The forecast data has (in part) the following structure. <weatherdata> … <forecast> <time … Continue reading →

Posted in internet, interoperability, web, XML | Tagged C#, C# programming, example, example program, internet, interoperability, temperature, temperature forecast, weather conditions, weather forecast, web, Windows Forms programming, XML | 5 Comments

Get weather forecast data in C#

Posted on May 16, 2016 by RodStephens

There are many sites that offer weather condition and weather forecast services. All of the ones I found required you to have a developer key, although most of them have a free membership that works for a simple program like … Continue reading →

Posted in internet, interoperability, web, XML | Tagged C#, C# programming, example, example program, internet, interoperability, weather conditions, weather forecast, web, Windows Forms programming, XML | Leave a comment

Download images from a web page in C#

Posted on February 13, 2016 by Rod Stephens

This is a big program and this description only touches on its most interesting parts. Download it to see the details. The program displays a WebBrowser control on the left. Click the links on the WebBrowser to navigate to a … Continue reading →

Posted in graphics, internet, web | Tagged C#, C# programming, DomElement, download, download images, example, example program, FlowLayoutPanel, FlowLayoutPanel control, graphics, HtmlDocument, HtmlElement, HTMLImg, internet, web, WebBrowser, WebBrowser control, Windows Forms programming | Leave a comment

Continuously graph stock prices in C#

Posted on July 28, 2015 by Rod Stephens

The example Get stock prices from the internet in C# explains how to get stock prices from the Yahoo! finance web site. This example uses similar techniques to query the site periodically and then graph stock prices. This example is … Continue reading →

Posted in algorithms, finance, graphics, internet, mathematics, multimedia, web | Tagged animation, C#, C# programming, continuously graph stock prices, example, example program, graph, graph stock prices, graphics, internet, multimedia, stock prices, stocks, web, Windows Forms programming | Leave a comment

Make an HTML table of thumbnail images in C#

Posted on June 23, 2015 by Rod Stephens

The post Make thumbnails and a web page to display the images in a directory in C# shows how to make thumbnails for the images in a directory and then build a web page to display them. There are lots … Continue reading →

Posted in files, html, image processing, internet, web | Tagged C#, C# programming, example, example program, files, html, HTML TABLE, image processing, images, internet, make thumbnails, make web page, web, Windows Forms programming | Leave a comment

Make thumbnails and a web page to display the images in a directory in C#

Posted on June 22, 2015 by Rod Stephens

This example searches a directory and makes thumbnails for each of the image files it finds there. It also builds a web page that displays the thumbnails and that includes links to the full-scale images. It puts all of the … Continue reading →

Posted in files, html, image processing, internet, web | Tagged C#, C# programming, example, example program, files, html, image processing, images, internet, make thumbnails, make web page, web, Windows Forms programming | Leave a comment

Make CAPTCHA images with overlapping characters in C#

Posted on January 28, 2015 by Rod Stephens

The following MakeCaptchaImage2 method creates a Bitmap containing a CAPTCHA image. private Random Rand = new Random(); // Draw the words with letters overlapping each other. private Bitmap MakeCaptchaImage2(string txt, int wid, int hgt, Font the_font, Brush the_brush) { Bitmap … Continue reading →