![]() If the control is valid, then it will remove the error message from the dictionary when there is any error. If the control is not valid, then it will add error message to the dictionary. Then, that control will be validated by the “ValidateSingleControl” method. ControlsValidating will get the control which raised the ‘Validating’ event, as a sender parameter. In my example, AttachHandlers method will attach event handler (Controls Validating) for both FirstName and LastName textboxes. So, whenever any control attached to that event lost focus, then the validation method will be called. i.e I have attached single validation method for multiple controls. ![]() So, I have used a single validation method to validate. But that is really going to be looking ugly when we have 15 or 20 textboxes or controls to be validated on a single form. You can have validating event for each text box. This event will be raised whenever the text box lost focus. If we need to display error message whenever the textbox lost focus, then you may want to use “Validating” event that comes with the controls. This example will show error messages whenever the textboxes lost focus, or whenever the Submit button clicked. txtFirstName, txtLastName, btnSubmit and CustomerDetailErrorProvider. CustomerDetailErrorProvider.SetError(txtFirstName, “First name is required”) įollowing example has two textboxes, button and an error provider control. Error provider will accept the field to which the error message should be displayed also, the error message which needs to be displayed. It can be used to get the error message by using the e.Text and also used to restrict display of error message box by handling this event like e.Cancel value as true.As you said Error providers can show error messages for the controls which are having seterror. The CurrentCellErrorMessage event will triggered while the error is occurred. When the validation is failed at the CurrentCellValidating event, the custom error provider will pop up the error message as of follows, SetError ( "Please enter the valid input" ) End If End If End Sub ControlText, val ) AndAlso val > 20 Then 'Display custom error provider Me. Renderer, GridTextBoxCellRenderer ) If renderer IsNot Nothing AndAlso Integer. ColIndex = 3 Then Dim val As Integer Dim renderer As GridTextBoxCellRenderer = Tr圜ast ( Me. CurrentCellValidating += AddressOf gridControl1_CurrentCellValidating Private Sub gridControl1_CurrentCellValidating ( ByVal sender As Object, ByVal e As CancelEventArgs ) If Me. 'Invoke this event for validate the conditions. If you want to change the text displayed in the Error message box, it can be done by setting the ValidationErrorText property. Validate () End Sub Customizing error text Private Sub button1_Click ( ByVal sender As Object, ByVal e As EventArgs ) Me. SetError ( "Please enter the valid input" ) End If End If End Sub ' Set the CellValue for the particular cell in a button click event. ControlText, val )) Then 'Display custom error provider Me. Renderer, GridTextBoxCellRenderer ) If renderer IsNot Nothing AndAlso ( Not Integer. CurrentCellValidating, AddressOf gridControl1_CurrentCellValidating Private Sub gridControl1_CurrentCellValidating ( ByVal sender As Object, ByVal e As CancelEventArgs ) If Me.
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