Anky Goyal | Techartifact

April 1, 2009May 13, 2009

IP Address validation in C#

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In this post, I have used Regular expression to validate if the IP address provided as string is valid IP Address or not.

Usefull when we want user to input IP address in our application and we want to check if the IP address is corrct format or not.

public bool IsValidIP(string addr)
{
//create our match pattern
string strPattern = @”^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$”;
//create our Regular Expression object
Regex check = new Regex(strPattern);
//boolean variable to hold the status
bool valid = false;
//check to make sure an ip address was provided
if (addr == “”)
{
//no address provided so return false
valid = false;
}
else
{
//address provided so use the IsMatch Method
//of the Regular Expression object
valid = check.IsMatch(addr, 0);
}
//return the results
return valid;
}

March 24, 2009May 13, 2009

Slide.Show:Open Source Slideshow control in Silverlight

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Are you Searching for a web control for your webpage which allows you to create a cool slideshow of images??

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Resizable for any Web page design
Full-screen and embedded modes
100% configurable via XML, themes, or your own custom provider
Slideshow data from XML, Flickr, or your own custom provider
Auto-playback with numerous transitions (e.g. fade, shape, slide, wipe)
Cross-browser (e.g. IE 6/7/8, Firefox 2/3, Safari 2/3, PC and Mac)
Open source (e.g. extensible, configuration and data provider models, templated controls, commented code)

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March 24, 2009May 13, 2009

Parsing an XML file from RSS feed with namespaces in C#

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The task is to parse a XML file retrieved from the RSS feed.
Below is the sample partial XML file taken from a Leading Geographical alerts website’s RSS feeds.

<?xml version="1.0" encoding="ISO-8859-1"?> 
<rss version="2.0" xmlns:geo="http://www.w3.org/2003/01/geo/"> 
<channel> 
<pubDate>Fri, 4 Jan 2008 09:51 GMT+1</pubDate> 

<item> 

<title>Red alert: Tropical Cyclone SINLAKU-08.</title> 
<description>Tropical Cyclone SINLAKU-08 .</description> 
<pubDate>Tue, 16 Sep 2008 06:00 GMT+1</pubDate> 
<geo:point> 
<geo:lat>27</geo:lat> 
<geo:long>124</geo:long> 
</geo:point> 
</item> 
<item> 

<title>Red alert: Tropical Cyclone IKE-08 .</title> 
<description>Tropical Cyclone IKE-08 .</description> 
<pubDate>Sun, 14 Sep 2008 09:00 GMT+1</pubDate> 
<geo:point> 
<geo:lat>36.400001526</geo:lat> 
<geo:long>-92.5</geo:long> 
</geo:point> 
</item> 

</channel> 
</rss>

As we can we there are two items(alerts) in the file one for Tropical Cyclone SINLAKU-08 and other for Tropical Cyclone IKE-08.

Lets write the code in c# to extract title,latitude and longitude of both the alerts.

First of all, lets load the XML data into the XMLDocument instance.

//include namespace for working with xml files
using System.Xml;
public partial class GoogleMap : System.Web.UI.Page
{
//creating new instance of xml document
XmlDocument xmlDoc = new XmlDocument();
protected void Page_Load(object sender, EventArgs e)
{
xmlDoc.Load(Server.MapPath(“~/XML Files/sourceRssEDIS.xml”));
//rest of the code described later will also be added here
}
}

Now, introduce the namespaces used in the xml file to the xmlDoc with the XmlNamespaceManager class instance.

XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsMgr.AddNamespace(“geo”, “http://www.w3.org/2003/01/geo/”);

Select all the items in a array using GetElementsByTagName() method.

XmlNodeList nodes = xmlDoc.GetElementsByTagName(“item”);

Iterate for the elements inthe nodes array using for loop and select the latitude and longitude values using SelectNodes() method as shown below and then set the values of text of respective labels.

for (int i = 0; i