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    Using ASP.NET

Wednesday, 28 March 2012

Bind dropdownlist in asp.net


Introduction: Hello friends, in this article i will explain that how we can bind dropdownlost dynamically in asp.net.This article is very useful for the all the .net developer. In this article i’ll the logic to bind the dropdownlist with the column of a table of the sql server in asp.net. 

Implementation: create a new website add a page bind_dropdownlist.aspxmpage. Drag and drop a dropdownlist  from the toolbox inside the  <body> body tag at the .aspx page.  Below  i am giving the complete code for the html page and .cs page. 

Code for bind_dropdownlist.aspx page

<head runat="server">
    <title>Bind Dropdownlist</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="dd_name" runat="server">
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>


Code for bind_dropdownlist.aspx.cs page

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


public partial class bind_dropdownlist : System.Web.UI.Page
{
    SqlCommand cmd = new SqlCommand();
    SqlConnection con = new SqlConnection();
    protected void Page_Load(object sender, EventArgs e)
    {

        // here i am declare connection 
        con.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        con.Open();
        if (Page.IsPostBack == false)
        {

            // here i am calling function  chart_bind(); in the page load event of the page
            bind_dd();
        }
    }

    private void bind_dd()
    {
       
        cmd = new SqlCommand();
        // here inside the cmd i am definning sql query to select the name from the table
        cmd.CommandText = "select name from tb_student_detail  group by name order by name";
        cmd.Connection = con;
        // here i am declairing the SqlDataReader to catch the values that will come from the sql query
        SqlDataReader dd_values;
        // here am declairing the ExecuteReader to execute SqlDataReade
        dd_values = cmd.ExecuteReader();
        // here i am binding the dropdownlist with the SqlDataReader
        dd_name.DataSource = dd_values;
        // here  i am binding the dropdownlist with the cloumn name of the table to show the
        // name inside the dropdownlist
        dd_name.DataValueField = "name";
        dd_name.DataBind();
        // after binding the dropdown list here i am closing and disposing  the SqlDataReader
        dd_values.Dispose();
        dd_values.Close();


    }
}
Database Script- create a table in database named tb_register. Here I am giving you to complete database script of the table tb_student_detail. See below:
/****** Object:  Table [dbo].[tb_student_detail]    Script Date: 04/10/2012 18:13:44 ******/
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tb_student_detail]') AND type in (N'U'))
DROP TABLE [dbo].[tb_student_detail]
GO
/****** Object:  Table [dbo].[tb_student_detail]    Script Date: 04/10/2012 18:13:44 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tb_student_detail]') AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[tb_student_detail](
      [id] [bigint] IDENTITY(1,1) NOT NULL,
      [name] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [science] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [english] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [math] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [biology] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [botany] [nvarchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_tb_student_detail] PRIMARY KEY CLUSTERED
(
      [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON)
)
END
GO
SET IDENTITY_INSERT [dbo].[tb_student_detail] ON
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (1, N'vikas', N'-45', N'20', N'-56', N'75', N'89')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (2, N'ragubeer', N'-25', N'29', N'79', N'36', N'96')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (3, N'akash', N'65', N'59', N'89', N'63', N'35')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (4, N'vimal', N'-35', N'-59', N'23', N'46', N'87')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (5, N'nisha', N'-65', N'99', N'93', N'56', N'21')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (6, N'manav', N'52', N'39', N'63', N'21', N'38')
INSERT [dbo].[tb_student_detail] ([id], [name], [science], [english], [math], [biology], [botany]) VALUES (7, N'susheel', N'-96', N'-54', N'-63', N'29', N'36')
SET IDENTITY_INSERT [dbo].[tb_student_detail] OFF



See output in this image:



Conclusion: In above code, I have been explained that how  we can bind dropdownlist dynamically in asp.net. This code is very helpful for every .net developer. Gud bye and take care developers.






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