![]() When the error icon is displayed, point at it with the mouse pointer to see the error text. The Clear-WFErrorProvider function will clear the error message on the Winforms control specified. Type invalid (in this example, non-numeric) data into the first control, and then tab to the second. System::ComponentModel::CancelEventHandler (Visual C#, Visual C++) Place the following code in the form's constructor to register the event handler. System::ComponentModel::CancelEventArgs ^ e)ĮrrorProvider1->SetError(textBox1, "Not an integer value.") As you can guess, it is used to accept textual input from the user. System::Void textBox1_Validating(System::Object ^ sender, What are the basic techniques for creating a control in net Common Controls in VB.NET Control. Protected void textBox1_Validating (object sender,ĮrrorProvider1.SetError(textBox1, "Not an integer value.") ![]() It is typically used in conjunction with validating user input on a form, or displaying errors within a dataset. Private Sub TextBox1_Validating(ByVal Sender As Object, _īyVal e As ) Handles _ĮrrorProvider1.SetError(TextBox1, "Not a numeric value.") The Windows Forms ErrorProvider component allows you to show the user in a non-intrusive way that something is wrong. The second argument is the error text to display. The first argument of the SetError method specifies which control to display the icon next to. ![]() The following code tests the validity of the data the user has entered if the data is invalid, the SetError method is called. For more information, see How to: Create Event Handlers at Run Time for Windows Forms. In order for this code to run properly, the procedure must be connected to the event. Select the first control and add code to its Validating event handler. ![]() To display an error icon when a control's value is invalidĪdd two controls - for example, text boxes - to a Windows Form.Īdd an ErrorProvider component to the form. You must have at least two controls on the form in order to tab between them and thereby invoke the validation code. You can use a Windows Forms ErrorProvider component to display an error icon when the user enters invalid data. ![]()
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