Back to Blog
The source code is now available in C# (Visual Studio 2005) edition. ValidationControl class has all required properties like DisplayName, ErrorMessage, Validate, ControlObj, etc. Each control is of type ValidationControl. It uses the ValidationControlCollection class which is derived from the CollectionBase class. I have used an extended collection base class for ErrorProviderExtended.Controls property. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = False End If End Sub End Classĭescription of ErrorProviderExtended class is included as comments in the source code. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = True Else ' if student's age is greater than 10, emergency contact is not mandatory If chkAge.Checked Then ' if student's age is less than 10, emergency contact is mandatory Object, _īyVal e As System.EventArgs) Handles chkAge.CheckedChanged MessageBox.Show( " Data submitted successfully.")Įnd If End Sub Private Sub chkAge_CheckedChanged( ByVal sender As System. If MyErrorProvider.CheckAndShowSummaryErrorMessage = True Then ' If any mandatory field is empty this function displays a message ' and returns FALSE. ' Following function checks all empty fields and returns TRUE ' if all fields are entered. Object, _īyVal e As System.EventArgs) Handles cmdSubmit.Click MyErrorProvider.SummaryMessage = " Following fields are mandatory," End Sub Private Sub cmdSubmit_Click( ByVal sender As System. MyErrorProvider.Controls(txtEmergenc圜ontact).Validate = False ' Set summary error message ' Initially make emergency contact field as non mandatory (txtEmergenc圜ontact, " Emergency Contact Number") ' Add controls one by one in error provider. Object, _īyVal e As System.EventArgs) Handles MyBase.Load The ErrorProvider control is an extender provider that lets you add properties to other controls. Private Sub TestForm_Load( ByVal sender As System. You need to display information related to error discovered in the Validating event, then we need to use the ErrorProvider control that provides a standard way to notify the user of an error. Private Sub txtZip_Validated(ByVal sender As Object, ByVal _Į As System.EventArgs) Handles txtZip.' Declare a variable Dim MyErrorProvider As New ErrorProviderExtended ' Give the ErrorProvider the error message to ' display.ĮrrorProvider1.SetError(txtZip, "Invalid ZIP code " & _ ' Cancel the event moving off of the control. Private Sub txtZip_Validating(ByVal sender As Object, ByVal _Į As ) Handles _ When you move to the third TextBox, the Validating event fires and the fun begins. If you move to the second TextBox, nothing happens because it has CausesValidation = False. The second has its CausesValidation property set to False while the third has CausesValidation = True.Įnter a value in the first TextBox. The first has the following event handlers thuat veify that it contains five digits. Use the ErrorProvider's SetError method to clear any previous error for that control. The Validated event handler executes when a control is successfully validated. Then use an ErrorProvider control's SetError method to flag the control's value as invalid. Optionally select theh offending text (for example, in a TextBox). If it does not, set the event handler's e.Cancel value to True to cancel the event that is trying to move out of the control. Use the Validating event to see if a control contains a valid value. Validate, validation, Validating, Validated VB Helper: HowTo: Use validation events in VB. after googling, found the answer, just set CauseValidation property of the cancel button to false.
0 Comments
Read More
Leave a Reply. |