docs-desktop/dotnet-desktop-guide/framework/winforms/controls/how-to-handle-errors-and-exceptions-that-occur-with-databinding.md

title, ms.date, dev_langs, helpviewer_keywords, ms.assetid

title	ms.date	dev_langs	helpviewer_keywords	ms.assetid
How to: Handle Errors and Exceptions that Occur with Databinding	03/30/2017	csharp vb cpp	error handling [Windows Forms], examples data binding [Windows Forms], examples examples [Windows Forms], error handling error handling [Windows Forms], data binding data binding [Windows Forms], error handling BindingSource component [Windows Forms], handling errors and exceptions	eddc5bad-9513-47df-ab28-f02d8dff7892

How to: Handle Errors and Exceptions that Occur with Databinding

Oftentimes exceptions and errors occur on the underlying business objects when you bind them to controls. You can intercept these errors and exceptions and then either recover or pass the error information to the user by handling the xref:System.Windows.Forms.Binding.BindingComplete event for a particular xref:System.Windows.Forms.Binding, xref:System.Windows.Forms.BindingSource, or xref:System.Windows.Forms.CurrencyManager component.

Example

This code example demonstrates how to handle errors and exceptions that occur during a data-binding operation. It demonstrates how to intercept errors by handling the xref:System.Windows.Forms.Binding.BindingComplete?displayProperty=nameWithType event of the xref:System.Windows.Forms.Binding objects. In order to intercept errors and exceptions by handling this event, you must enable formatting for the binding. You can enable formatting when the binding is constructed or added to the binding collection, or by setting the xref:System.Windows.Forms.Binding.FormattingEnabled%2A property to true.

[!code-cppSystem.Windows.Forms.DataConnectorBindingComplete#3] [!code-csharpSystem.Windows.Forms.DataConnectorBindingComplete#3] [!code-vbSystem.Windows.Forms.DataConnectorBindingComplete#3]

When the code is running and an empty string is entered for the part name or a value less than 100 is entered for the part number, a message box appears. This is a result of handling the xref:System.Windows.Forms.Binding.BindingComplete?displayProperty=nameWithType event for these textbox bindings.

Compiling the Code

This example requires:

• References to the System, System.Drawing and System.Windows.Forms assemblies.

See also

• xref:System.Windows.Forms.Binding.BindingComplete?displayProperty=nameWithType
• xref:System.Windows.Forms.BindingSource.BindingComplete?displayProperty=nameWithType
• BindingSource Component