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BindingGroup.UpdateSources Method

Updated: July 2008

Runs the converter on the binding and the ValidationRule objects that have the ValidationStep property set to RawProposedValue, ConvertedProposedValue, or UpdatedValue and saves the values of the targets to the source objects if all the validation rules succeed.

Namespace:  System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

public bool UpdateSources()
You cannot use methods in XAML.

Return Value

Type: System.Boolean
true if all validation rules succeed; otherwise, false.

This method updates the source if every ValidationRule succeeds, but it does not cause the sources to commit the pending changes and end the edit transaction. That is, if the source object implements IEditableObject. Calling this method does not cause EndEdit to be called. Use the CommitEdit method to have the sources commit the pending changes.

The following example is part of an application that prompts the user to enter multiple customers and assign a sales representative to each customer. The application checks that the sales representative and the customer belong to the same region. The example calls UpdateSources to validate the bindings and save the values to the source if all the validation rules succeed. For the entire example, see Validate an Item in an ItemsControl Sample.

void saveCustomer_Click(object sender, RoutedEventArgs e)
    Button btn = sender as Button;
    FrameworkElement container = (FrameworkElement) customerList.ContainerFromElement(btn);

    // If the user is trying to change an items, when another item has an error, 
    // display a message and cancel the currently edited item. 
    if (bindingGroupInError != null && bindingGroupInError != container.BindingGroup)
        MessageBox.Show("Please correct the data in error before changing another customer");

    if (container.BindingGroup.UpdateSources())
        bindingGroupInError = null;
        MessageBox.Show("Item Saved");
        bindingGroupInError = container.BindingGroup;


Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5 SP1, 3.0 SP2




July 2008

Added topic for new class.

SP1 feature change.