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Tuesday, October 8, 2013
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How to bind DropDownlist using Xml file in ASP.NET

1:53 AMTuesday, October 8, 2013

XML File Introduction

XML file is a text file. basically XML file is used for carry data.
Features of XML file
1. Its a Case sensitive language.
2. Use User defined tags
3. Used for communication purpose
4. Its not a presentation language .
5. Same as HTML language.
6. Use Tree based architecture

The DropDownList control displays the list of data as a drop-down list from which you can make a single selection. The DropDownList control exists within the System.Web.UI.WebControls namespace. You cannot select multiple items in this control because when you make a selection from the list, the list closes automatically.
The DropDownList control has no non-inherited methods or events. This class inherited the ListControl class.

Public Properties of DropDownList Class

SelectedIndex : Obtains or sets the index of the selected item in the control.

Application of DropDownList Control


  • In Registration page where you can select your country in given DropDownList.
  • In management project where you can select single option in given options.

Lets take an simple example to bind DropdownList 

Step-1. Create a XML file with <Countries> tag.

<?xml version="1.0" encoding="utf-8" ?>
<Countries>
  <country>
    <countryId>101</countryId>
    <countryName>USA</countryName>
   
  </country>
  <country>
    <countryId>102</countryId>
    <countryName>India</countryName>

  </country>

  <country>
    <countryId>103</countryId>
    <countryName>UK</countryName>

  </country
 
 
</Countries>


Step-2 : Drag one DropdownList from ToolBox and Drop to design window.
Step-3 : Create a DataSet instance 
Step-4 : Read XML file by ReadXML() method
Step-5 :Bind DropdownList with DataSet Instance.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataSet ds = new DataSet();
      
        ds.ReadXml(Server.MapPath("countries.xml"));
        DropDownList1.DataSource = ds;
        DropDownList1.DataTextField = "countryName";
        DropDownList1.DataValueField = "countryId";
        DropDownList1.DataBind();
       

    }

}
Output
How to bind DropDownlist using Xml file in ASP.NET

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1 comments :

  1. This is really good article . have a look of this article.
    http://www.dotnetpools.com/2012/10/binding-dropdownlist-control-to-xml.html

    ReplyDelete

 
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