Enabling Automatic PostBacks : DropDownList « Data Binding « ASP.NET Tutorial

ASP.NET Tutorial
1. ASP.Net Instroduction
2. Language Basics
3. ASP.net Controls
4. HTML Controls
5. Page Lifecycle
6. Response
7. Collections
8. Validation
9. Development
10. File Directory
11. Sessions
12. Cookie
13. Cache
14. Custom Controls
15. Profile
16. Configuration
17. LINQ
18. ADO.net Database
19. Data Binding
20. Ajax
21. Authentication Authorization
22. I18N
23. Mobile
24. WebPart
25. XML
Java
Java Tutorial
Java Source Code / Java Documentation
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
ASP.NET Tutorial » Data Binding » DropDownList 
19. 13. 4. Enabling Automatic PostBacks
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

    protected void ddlProducts_SelectedIndexChanged(object sender, EventArgs e)
    {
        lblSelectedProduct.Text = ddlProducts.SelectedItem.Text;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>AutoPostBack List Control</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:DropDownList
        id="ddlProducts"
        DataSourceID="srcProducts"
        DataTextField="Title"
        DataValueField="Id"
        AutoPostBack="true"
        OnSelectedIndexChanged="ddlProducts_SelectedIndexChanged"
        Runat="server" />

    <br /><br />

    <asp:Label
        id="lblSelectedProduct"
        Runat="server" />

    <asp:SqlDataSource
        id="srcProducts"
        SelectCommand="SELECT Id, Title FROM Products"
        ConnectionString="<%$ ConnectionStrings:Products %>"
        Runat="server" />

    </div>
    </form>
</body>
</html>

File: Web.config

<configuration>
  <connectionStrings>
    <add name="Products" 
         connectionString="Data Source=.\SQLEXPRESS;
         AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
  </connectionStrings>
</configuration>
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
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.