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 To avoid conflicts at run time that can occur when changing DataSource and DataMember, you should use BindToDataAndErrors instead of setting DataSource and DataMember individually.Tasks illustrated in this walkthrough include: The DataMember is a navigation string based on DataSource. Row.SetColumnError("PostalCode", "Postal Code required") Row.RowError = "The Customer details contain errors" If Convert.ToBoolean(row("PostalCodeIsNull")) Then Private Sub buttonSave_Click(ByVal sender As Object, ByVal e As System.EventArgs)ĬustomersTable = dataSet1.Tables("Customers") ' it does not need to be added to the form. ' Since the ErrorProvider control does not have a visible component, ' You set the DataSource to a data set, and the DataMember to a table.ĮrrorProvider1.DataMember = dataTable1.TableName Row.RowError="The Customer details contain errors" Private void buttonSave_Click(object sender, System.EventArgs e)ĬustomersTable = dataSet1.Tables įoreach (DataRow row in (CustomersTable.Rows)) Row->SetColumnError( "PostalCode", "Postal Code required" ) ĮrrorProvider1.DataMember = dataTable1.TableName Row->RowError = "The Customer details contain errors" ![]() System::Collections::IEnumerator^ myEnum = (CustomersTable->Rows)->GetEnumerator() ĭataRow^ row = safe_cast(myEnum->Current) Void buttonSave_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )ĬustomersTable = dataSet1->Tables it does not need to be added to the form. Since the ErrorProvider control does not have a visible component, You set the DataSource to a data set, and the DataMember to a table.ĮrrorProvider1->DataMember = dataTable1->TableName The following code example shows how to use the ErrorProvider with a DataSource and DataMember to indicate a data error to the user. ![]() The string that represents a list within the data source specified by the DataSource to be monitored.
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