Repeater and DropDownList : DropDownList « Data Binding « ASP.NET Tutorial

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ASP.NET Tutorial » Data Binding » DropDownList 
19. 13. 10. Repeater and DropDownList
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Repeater in action</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:DropDownList ID="Countries" runat="server" 
                AutoPostBack="true" 
                AppendDataBoundItems="True" 
                OnSelectedIndexChanged="Countries_SelectedIndexChanged">
                <asp:ListItem>[No country]</asp:ListItem>
            </asp:DropDownList>
            
            <asp:Repeater ID="Repeater1" runat="server">
                <HeaderTemplate>
                    <h2>We have customers in the following cities</h2>
                    <hr />
                </HeaderTemplate> 
                <SeparatorTemplate>
                    <hr noshade style="border:dashed 1px blue" />
                </SeparatorTemplate>
                <ItemTemplate>
                    <%# Eval("City"%> &nbsp;&nbsp;<b><%# Eval("Country")%></b>
                </ItemTemplate>
                <FooterTemplate>
                    <hr />
                    <%# CalcTotal() %> cities
                </FooterTemplate>
            </asp:Repeater>
        </form>
    </div>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;


public partial class Default : System.Web.UI.Page
{
    DataTable data;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            FillCountries();
        }
    }

    protected void FillCountries()
    {
        string connString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
        string cmdText = "SELECT DISTINCT country FROM customers;";

        data = new DataTable();
        SqlDataAdapter adapter = new SqlDataAdapter(cmdText, connString);
        adapter.Fill(data);
        Countries.DataSource = data;
        Countries.DataTextField = "country";
        Countries.DataBind();
    }

    protected int CalcTotal()
    {
        return data.Rows.Count;
    }

    protected void Countries_SelectedIndexChanged(object sender, EventArgs e)
    {
        string connString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
        string cmdText = "SELECT DISTINCT country, city FROM customers WHERE country=@TheCountry";

        data = new DataTable();
        SqlDataAdapter adapter = new SqlDataAdapter(cmdText, connString);
        adapter.SelectCommand.Parameters.AddWithValue("@TheCountry", Countries.SelectedValue);
        adapter.Fill(data);
        Repeater1.DataSource = data;
        Repeater1.DataBind();
    }
}
19. 13. DropDownList
19. 13. 1. Binding to a Data Source
19. 13. 2. Determining the Selected List Item: SelectedIndex, SelectedItem, SelectedValue
19. 13. 3. Master/Details form with a list control
19. 13. 4. Enabling Automatic PostBacks
19. 13. 5. Table record editor by DropDownList and ListBox
19. 13. 6. Link DropDownList with SqlDataSource and do the editing
19. 13. 7. Prevent overlapping edits.
19. 13. 8. Binding ArrayList to asp:DropDownList
19. 13. 9. Data binding by filling list and drop-down list controls with the results of direct ADO.NET queries
19. 13. 10. Repeater and DropDownList
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