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VB NET ERRORPROVIDER EXAMPLE HOW TO
VB NET ERRORPROVIDER EXAMPLE CODE
VB NET ERRORPROVIDER EXAMPLE WINDOWS

Drop it from the top of the toolbox onto the form.

VB NET ERRORPROVIDER EXAMPLE CODE

You only need it if you add any controls after the form's Load event fired or if you need to modify the warning text.Īdd a new class to your project and paste the code shown below. SetError() is a replacement of ErrorProvider.SetError().

It returns false if no warnings are remaining.

FocusError() sets the focus to the first control that has a warning icon, if any.

Handy in your OK button's Click event handler.

Using the MaskInputRejected event handler to alert the user when a character does not conform to the mask.

HasErrors returns true if the any active warning icons are displayed. Tasks illustrated in this walkthrough include: Initializing the MaskedTextBox control.

ShowError(Control ctl, bool enable) displays the text that you entered at design-time when the enable argument is true.

It is fixable however, I'll give an example in C# that extends the component with some new capabilities:

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VB NET ERRORPROVIDER EXAMPLE HOW TO

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VB NET ERRORPROVIDER EXAMPLE WINDOWS

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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.