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Vb net errorprovider example1/3/2024 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. Please change the value.The following code example demonstrates using the ErrorProvider class to notify the user of a data entry error. ToolTip1.Show("We're sorry, but the value you entered is not a valid date. ToolTip1.ToolTipTitle = "Invalid Date Value" Public Sub MaskedTextBox1_TypeValidationCompleted(sender as Object, e as TypeValidationEventArgs) Please change the value.", maskedTextBox1, 5000) MaskedTextBox1.ValidatingType = GetType(System.DateTime)Īdd an event handler for the TypeValidationCompleted event: public void maskedTextBox1_TypeValidationCompleted(object sender, TypeValidationEventArgs e) Private Sub Form1_Load(sender as Object, e as EventArgs) MaskedTextBox1.TypeValidationCompleted += new TypeValidationEventHandler(maskedTextBox1_TypeValidationCompleted) MaskedTextBox1.ValidatingType = typeof(System.DateTime) In your form's Load event handler, assign a Type object representing the DateTime type to the MaskedTextBox control's ValidatingType property: private void Form1_Load(Object sender, EventArgs e) ToolTip1.Show("We're sorry, but only digits (0-9) are allowed in dates.", MaskedTextBox1, 5000)Īlert the User to a Type that Is Not Valid Add a balloon tip for invalid data types Private Sub MaskedTextBox1_MaskInputRejected(sender as Object, e as MaskInputRejectedEventArgs) Handles MaskedTextBox1.MaskInputRejected Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load ToolTip1.Show("We're sorry, but only digits (0-9) are allowed in dates.", maskedTextBox1, maskedTextBox1.Location, 5000) Void maskedTextBox1_MaskInputRejected(object sender, MaskInputRejectedEventArgs e) MaskedTextBox1.MaskInputRejected += new MaskInputRejectedEventHandler(maskedTextBox1_MaskInputRejected) public void Form1_Load(Object sender, EventArgs e) The balloon tip remains visible for five seconds, or until the user clicks it. Return to the Toolbox and add a ToolTip to your form.Ĭreate an event handler for the MaskInputRejected event that raises the ToolTip when an input error occurs. Alert the User to Input Errors Add a balloon tip for rejected mask input This property causes a short beep to sound every time the user attempts to input a character that violates the mask definition.įor a summary of the characters that the Mask property supports, see the Remarks section of the Mask property. In the Properties window set the BeepOnError property to true. In the Input Mask dialog box, select the Short Date mask and click OK. (ellipsis) button next to the property name. In the Properties window, select the Mask property and click the. Right-click the control and choose Properties. Open the form on which you want to place the MaskedTextBox control.ĭrag a MaskedTextBox control from the Toolbox to your form. Using the MaskInputRejected event handler to alert the user when a character does not conform to the maskĪssigning a type to the ValidatingType property and using the TypeValidationCompleted event handler to alert the user when the value they're attempting to commit is not valid for the typeĬreating the Project and Adding a Control To add a MaskedTextBox control to your form Tasks illustrated in this walkthrough include:
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