Bind DropDownList With SQL Database In ASP.NET Web Forms | Learn ASP.NET
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;
using System.Data;
namespace PopulateDataInDropDown
{
public partial class WebForm1 : System.Web.UI.Page
{
string cs = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindDropDownList();
}
}
void BindDropDownList()
{
SqlConnection con = new SqlConnection(cs);
string query = "select * from employee";
SqlDataAdapter sda = new SqlDataAdapter(query,con);
DataTable data = new DataTable();
sda.Fill(data);
DropDownList1.DataSource = data;
DropDownList1.DataTextField = "name";
DropDownList1.DataValueField = "id";
DropDownList1.DataBind();
ListItem SelectItem = new ListItem("Select Employee","-1");
SelectItem.Selected = true;
DropDownList1.Items.Insert(0,SelectItem);
}
protected void Button1_Click(object sender, EventArgs e)
{
if (DropDownList1.SelectedValue == "-1")
{
Response.Write("Please select an employee");
}
else
{
Response.Write("Selected Item Text is : " + DropDownList1.SelectedItem.Text + "<br>");
Response.Write("Selected Item Value is : " + DropDownList1.SelectedItem.Value + "<br>");
Response.Write("Selected Item Index is : " + DropDownList1.SelectedIndex + "<br>");
}
}
}
}
Above File is PopulateDataInDropDown\WebForm1.aspx.cs
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="PopulateDataInDropDown.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" runat="server" Height="22px" Width="186px">
</asp:DropDownList>
<div>
<br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
</div>
</form>
</body>
</html>
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