Export (0) Print
Expand All
Expand Minimize

ListView.UpdateItem Method

Updates the record at the specified index in the data source.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

public virtual void UpdateItem(
	int itemIndex,
	bool causesValidation
)

Parameters

itemIndex
Type: System.Int32

The index of the item to update.

causesValidation
Type: System.Boolean

true to perform page validation when this method is called; otherwise, false.

ExceptionCondition
InvalidOperationException

itemIndex is less than 0.

-or-

The DataSourceView object that is associated with the ListView control is null.

Use the UpdateItem method to programmatically update the record at the specified index in the data source. You typically use this method when you want to update a record from outside the ListView control, such as from a different control on the page.

NoteNote

This method can be called only for an item that contains a two-way data-bound input control. For more information about two-way binding expressions, see Binding to Databases.

To specify whether page validation is performed before the update operation, use the causesValidation parameter.

This method raises the ItemUpdated and ItemUpdating events.

The following example shows how to use the UpdateItem method to programmatically update a ListView item in the data source.

<%@ Page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  protected void PreferredCheckBox_CheckedChanged(object sender, EventArgs e)
  {
    // Gets the CheckBox object that fired the event.
    CheckBox chkBox = (CheckBox) sender;

    // Gets the item that contains the CheckBox object. 
    ListViewDataItem item = (ListViewDataItem) chkBox.Parent.Parent;

    // Update the database with the changes.
    VendorsListView.UpdateItem(item.DisplayIndex, false);
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView UpdateItem Example</title>
  </head>
  <body>
    <form id="form1" runat="server">

      <h3>ListView UpdateItem Example</h3>

      <asp:ListView ID="VendorsListView" 
        DataSourceID="VendorsDataSource"
        DataKeyNames="VendorID"
        runat="server">
        <LayoutTemplate>
          Select your preferred vendors:
          <ul runat="server" id="lstVendors" style="text-align:left">
            <li runat="server" id="itemPlaceholder" />
          </ul>
          <asp:DataPager ID="VendorsDataPager" runat="server" PageSize="15">
            <Fields>
              <asp:NumericPagerField ButtonCount="10" />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <li runat="server">
            <asp:CheckBox runat="server" ID="PreferredCheckBox" AutoPostBack="True" 
              Checked='<%# Bind("PreferredVendorStatus") %>' 				        
              OnCheckedChanged="PreferredCheckBox_CheckedChanged" />
            <asp:Label runat="server" ID="NameLabel" text='<%# Eval("Name") %>' /><br/>
          </li>
        </ItemTemplate>
      </asp:ListView>

      <!-- This example uses Microsoft SQL Server and connects    -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET  -->
      <!-- expression to retrieve the connection string value     -->
      <!-- from the Web.config file.                              -->
      <asp:SqlDataSource ID="VendorsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT VendorID, Name, PreferredVendorStatus
          FROM Purchasing.Vendor WHERE (ActiveFlag = 1)" 
        UpdateCommand="UPDATE Purchasing.Vendor 
          SET PreferredVendorStatus = @PreferredVendorStatus 
          WHERE (VendorID = @VendorID)" >
      </asp:SqlDataSource>

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft