Public ref class Form1: public System::Windows::Forms::Form The SetError method is called with or without appropriate error text during a control's Validated event, depending upon the content in the control. The example sets error icon options using the BlinkRate and BlinkStyle properties and the SetIconAlignment and SetIconPadding methods. The example creates a Form that contains a TextBox control, a NumericUpDown control, and a ComboBox control, each validating its content, and an ErrorProvider for each control.
#VB.NET ERRORPROVIDER CODE#
The following code example demonstrates using the ErrorProvider class to notify the user of a data entry error. IExtenderProvider ISupportInitialize Examples Implements IExtenderProvider, ISupportInitialize Inheritance Implements IExtenderProvider Public Class ErrorProvider Interface ISupportInitialize Public Class ErrorProvider Public class ErrorProvider :, , type ErrorProvider = class In this article public ref class ErrorProvider : System::ComponentModel::Component, System::ComponentModel::IExtenderProvider public ref class ErrorProvider : System::ComponentModel::Component, System::ComponentModel::IExtenderProvider, System::ComponentModel::ISupportInitialize public class ErrorProvider :,
#VB.NET ERRORPROVIDER HOW TO#
#VB.NET ERRORPROVIDER WINDOWS#
Xml database in Windows Forms application using Visual Studio 2010 in VB.NET.TabControl in a Windows Forms application in Visual Studio 2010 in VB.NET.Setup for a Windows Forms application using Visual Studio 2010 in VB.NET.The key method of the ErrorProvider component is the SetError method, which specifies the error message string and where the error icon should appear. When the DataSourceproperty is set, the ErrorProvider component can display error messages for a dataset. The Icon property can be set to a custom error icon instead of the default. When the component is added in the designer, the ContainerControl property is set to the containing form if you add the control in code, you must set it yourself. The ContainerControl property must be set to the appropriate container (usually the Windows Form) in order for the ErrorProvider component to display an error icon on the form. The ErrorProvider component's key properties are DataSource, ContainerControl, and Icon. The ErrorProvider component displays an error icon ( ) next to the relevant control, such as a text box when the user positions the mouse pointer over the error icon, a ToolTip appears, showing the error message string.
An error provider is a better alternative than displaying an error message in a message box, because once a message box is dismissed, the error message is no longer visible. It is typically used in conjunction with validating user input on a form, or displaying errors within a dataset. The Windows Forms ErrorProvider component is used to validate user input on a form or control.
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