Determining the Selected List Item: SelectedIndex, SelectedItem, SelectedValue : DropDownList « Data Binding « ASP.NET Tutorial






<%@ 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 btnSelect_Click(object sender, EventArgs e)
    {
        lblSelectedProduct.Text = ddlProducts.SelectedItem.Text;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Select Product</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

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

    <asp:Button
        id="btnSelect"
        Text="Select"
        OnClick="btnSelect_Click"
        Runat="server" />

    <hr />

    <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