Sometimes we may need to pass values (server side) to the client functions (javascript) on the GridView controls. In such case, we can attach the javascript functions to the GridView controls from code-behind using the RowDataBound event of the GridView.

I have a GridView that is bound to an ObjectDataSource, and I have converted one of the column into a TemplateField, so that I can access the controls in the underlying templates.

To attach a javascript function the Button1, we add the attributes in the RowDataBound event ( I use RowDataBound event because, you can access the underlying DataItem of the row, so that we can pass the database values to the javascript function. You can also use the RowCreatedEvent of the GridView to add the attributes.)



This way you can pass parameters from code-behind to javascript methods for the controls inside a GridView. My next post will be on how to access the underlying data in the RowDataBound event which helps in manipulating and customizing the way data is presented

E Screw

LINQ provides an easy way to save the master-child data and you need not worry about the PK/FK relations or manage them manually. Let us see how to save the Country/City information using LINQ

Create an instance of the DataContext you are working on. DataContext will be created when you create a new Linq To Sql file (.dbml). Drag the tables Country and City onto the designer and the relation will be created automatically. You can also see the filed names of the corresponding tables shown as properties the classes.

Create the new Country and City



E Screw

Recently I wrote an article about using ModalPopupExtender at www.aspalliance.com 

Check the article here www.aspalliance.com/1509

E Screw

I have found a good article on preventing the duplicate record insertion on page refresh by Terri Mortan. Check the article here http://aspalliance.com/687

E Screw

Using the Stopwatch class (available from .NET 2.0) we can display the amount of time taken to process the page. Stopwatch gets you the most accurate time elapsed in milliseconds or ticks and the code below displays the time taken for the entire page life cycle to be processed.

Stopwatch class is available in System.Diagnostics namespace.

[code:c#]public partial class TestPage : System.Web.UI.Page {      
// when the page is instantiated we start our stopwatch      
System.Diagnostics.Stopwatch sw = System.Diagnostics.Stopwatch.StartNew();        
protected void Page_Load (object sender, EventArgs e)  {            
// your page load code      
}      
// override the Render method      
protected override void Render (HtmlTextWriter writer)  {            
// get the total time elapsed. this will be in milliseconds            
// and I converted it to seconds            
float _seconds = ((float)sw.ElapsedMilliseconds/1000);            
// display the information in a label            
this.lblPageGeneratedIn.Text = "Page generated in " + 
_seconds.ToString() + " seconds";            
base.Render(writer);      
}
class="kwd">}[/code]
 

E Screw

I have found a good article on using the filters and transitions for use in web pages using the CSS and JavaScript. Check this link http://msdn2.microsoft.com/en-us/library/ms532847.aspx


E Screw

I have found a good article on using the filters and transitions for use in web pages using the CSS and JavaScript. Check this link http://msdn2.microsoft.com/en-us/library/ms532847.aspx

E Screw

Sometimes we may need to have the day names in a week for a given culture. With ASP.NET CultureInfo class you can loop through the DateTimeFormat.DayNames and get them. Here is the example of it



Depending on the culture you want, you can get the CultureInfo reference for that corresponding culture. The DateTimeFormat also provides other values like month names, first day of week etc.,

- Electronic Screw

WebserviceX.net provides a wide range of webservices, that can be used freely in development. GeoIPService is one webservice available with them that can be used to display the users country information that he/she was browsing from. 

A small example on how to use the webservice (GeoIPService) in asp.net development. Create a new Project in Visual Studio. Right click on the project in the Solution Explorer and Click Add Web reference. In the Add Web Reference dialog box, enter the following url in the URL: box and click Go button.

http://www.webservicex.net/geoipservice.asmx?wsdl

If the webservice is found, the information will be displayed in the respective boxes. Click on Add Reference button. By default the web service will be added with the following namespace net.webservicex.www

The required webserive files will be added automatically in the App_WebReferences folder created under the root of your application. You will see the geoipservice.discomap and geoipservice.wsdl added under the net >> webservicex >> www folder.

Note: geoipservice.discomap and geoipservice.wsdl are the discovery and webservice definition language files, that provides the necessary methods and classes.

Now , we use the classes and methods provided by the webservice in our page to display the country information like name etc..

Here is a sample listing on how to use in the aspx page (C# code)

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using net.webservicex.www;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
      // set the current country name
      StringBuilder _stringToDisplay = new StringBuilder();
      GeoIPService _gipService = new GeoIPService();
      GeoIP _geoIP = _gipService.GetGeoIP(Request.UserHostAddress.ToString());
      _stringToDisplay.Append(_geoIP.CountryName);
      _stringToDisplay.Append(" [" + _geoIP.CountryCode + "] ");
      
      lblCountryName.Text = _stringToDisplay.ToString();
   }
}

A sample of this implementation can be seen in my home page http://www.g9th.com in the top right corner.

-Electronic Screw