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Dynamic Dropdownlist in ASP.NET by a text file

By xrmlabs webmaster on 3/26/2013

Dynamic Dropdownlist in ASP.NET by a text file  

 Sometime we need the change the items in the dropdown list and we need it to change it rapidly if we define the items in the dropdown list then to change it the whole code is to be modified and reviewed it causes some times break down also . Here is a simple code to bind the drop down list to a text file so we can easily modified the text file according to our requirement  here I have taken the name of the product in a text file and bind it to a dropdown list .
Default.aspx

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<head runat="server">
    <title>Untitled Pagetitle>
head>
<body>
    <form id="form1" runat="server">
    <div>
        Select product from the list<br />
        <asp:DropDownList ID="DrpProduct" runat="server" Style="position: relative" Width="151px">
        asp:DropDownList>
        Quantity
        <asp:TextBox ID="txtquantity" runat="server" Style="position: relative">asp:TextBox><br />
         
 
        Price<br />
        <asp:TextBox ID="txtPrice" runat="server" Style="position: relative">asp:TextBox><br />
       <asp:ImageButton ID="Image1" runat="server" ImageUrl="images/go.jpg" OnClick="ImageButton1_Click"
            Style="position: relative" />
        
        Total cost<br />
        <asp:TextBox ID="txtTotalcost" runat="server" Style="position: relative">asp:TextBox>div>
    form>
body>
html>

Default.aspx.cs

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 System.IO;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.IsPostBack == false)     // means before submit - 1st time
        {
 
            string path = MapPath("~/prod.txt");           
            FileStream fp = new FileStream(path, FileMode.Open);
            StreamReader reader = new StreamReader(fp);
            string data;
            while ((data = reader.ReadLine()) != null)
            {
                string[] v = data.Split(',');
                 
                foreach (string entry in v )
                {
                    DrpProduct.Items.Add(entry);
                }
 
            }
            reader.Close();
            fp.Close();
        }
    }
    protected void Image1_Click(object sender, ImageClickEventArgs e)
    {
        long total = int.Parse(txtPrice.Text) * int.Parse(txtquantity.Text);
        txtTotalcost.Text = total.ToString();
    }
}

Screenshot 1


Screenshot 2




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ASP.NET Dynamic Drop down list
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