Introduction
In this blog, I explained how to bind data to Dropdown List control using SQLDataSource in web application in Asp.net
Dropdownlist Control
It’s enables users to select from a single-selection drop-down list. The drop-down list contains "n" number of items.
The DropDown List control also supports data binding, such as data to bind the control to a data source like object data source, xml data source and Sql data source, that contains the items to display in the control. This DropDown List control can be used to add data manually or even dynamically data binding from database.
DataBind Method
The method to bind the data source to the DropDown List control
DataTextField, DataValueField Property
To specify which field in the data source to bind to the Text and Value properties of each list item in the control.
SelectedIndex Property
The SelectedIndex property to programmatically determine the index of the item selected by the user from the DropDown List control.
Code
- <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Dropdownlist.aspx.cs" Inherits="Dropdownlist" %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml" >
- <head id="Head1" runat="server">
- <title>Asp.Net Dropdownlist control</title>
- </head>
- <body>
- <form id="form1" runat="server">
- <div>
- <table>
- <tr>
- <td style="height: 45px"><asp:Label ID="Label1" runat="server" Style="left: -1px; position: relative; top: 0px"
- Text="Name:" Width="46px"></asp:Label></td>
- <td style="height: 45px"><asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1"
- DataTextField="EmpName" DataValueField="EmpName" Height="26px" Style="left: 3px;
- position: relative; top: 0px" Width="125px">
- <asp:ListItem> << Select >></asp:ListItem>
- </asp:DropDownList></td>
- <td style="height: 45px">
- <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:masterConnectionString %>"
- SelectCommand="SELECT [EmpName] FROM [tbl_employee_profile]"></asp:SqlDataSource></td>
- </tr>
- </table>
- <asp:DropDownList ID="DropDownList" runat="server">
- </asp:DropDownList>
- </div>
- </form>
- </body>
- </html>