User control validating event


01-Sep-2020 19:11

So, which is the better option, in terms of both efficiency and industry-standards?

You should always use the Validating event, it was made to support validation.

Validating If Type Of sender Is Text Box Then Dim tb As Text Box = sender 'Check if the Text Box is empty If String.

Trim()) Then 'Show error message using Error Provider Me. Set Error(tb, "Error message") 'Cancel the events of the sender after Validating event e.

Below is a simple code sample for general validation purpose. Cause Validation: True Private Sub Button Send_Click(By Val sender As System.

For example, if you have a text box that must contain a postal code, you can perform the validation in the following ways: The Validating event is supplied an object of type Cancel Event Args. It specifies whether the control is validated on focus change by the Auto Validate enumerated value. (Explicit validation) How to close the form when validation failed using Auto Validate : There’s no problem closing the form if Auto Validate is set to Disable or Enable Allow Focus Change. A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.

The masking language that is used by Masked Text Box is very flexible. Empty) End If End If End Sub Private Sub Validation Test_Form Closing( _ By Val sender As System.



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