Question

I’m not sure if I’m using the wrong terminology so that may be why my searching has not turned up anything.

I have a bunch of text boxes that I want to validate and check that they don’t contain apostrophes. The code that I have is:

public void apostropheCheck(TextBox fieldName)
{
    Match m = Regex.Match(fieldName.Text, @"'");

    if (m.Success)
    {
        validationErrorProvider.SetError(fieldName, "Field can not contain apostrophes");
    }
    else if (!m.Success)
    {
        validationErrorProvider.SetError(fieldName, "");
    }
}

and the validation on the textbox is:

private void FirstNameTextBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
    //Checks for apostrophes
    apostropheCheck(FirstNameTextBox);
}

However when I run this the value that gets passed to the void is the text that is in the text box (e.g ‘John’ or ‘Mary’) I could get this to work just using the code that’s in the void for each validation event but that would be repeating myself a lot. Is there a better way?

Answer 1

The sender object of the event is a TextBox, so you can cast it to a text box and repeat the same event handler for all of the text boxes in your application

private void FirstNameTextBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
{
    apostropheCheck(((TextBox)sender).Text);
}