How do I add a message box or alert to a MaskTextbox if the user enters no numbers?

NovicePGM2011 · March 21st, 2011, 01:43 PM

Hello everyone.

I have a MaskedTextbox which takes Us Phone numbers.
Using The MaskedTextBox ensures the user can enter only numbers and the number gets formatted right.

Here is the problem I am having: How do I add an error message if the box is left empty? I am not trying to validate the number, just need a way to add: "You forgot to enter a number." Can I add this to a MaskedTextBox?

How do I add a message box or alert to a MaskTextbox if the user hit submit without entering numbers?

Thanks everyone!

PGM

Apocolypse2005 · March 21st, 2011, 01:50 PM

Code:

If mytextBox.text = String.IsEmpty Then

End If

String.IsEmpty is possibly a function, if so:

Code:

If String.IsEmpty(myTextBox.Text) Then
'is empty
End If

NovicePGM2011 · March 21st, 2011, 05:26 PM

Quote:

Originally Posted by Apocolypse2005

Code:

If mytextBox.text = String.IsEmpty Then

End If

String.IsEmpty is possibly a function, if so:

Code:

If String.IsEmpty(myTextBox.Text) Then
'is empty
End If

This wouldn't work because we are talking about numbers not strings.
Because the MaskedTextBox is set to collect phone number.

I get the following error message.

IsEmpty is not a member of string.

Any other ideas?

Thanks Again

PGM

GeneBuchite · March 23rd, 2011, 06:21 AM

you Could use the IsNumeric()

Code:

 
IF Not IsNumeric(myTextBox.Text)  Then MSgBox "You forgot to enter a number."

OR LEN()

Code:

 
IF Len(myTextBox.Text) < 1 Then MSgBox "You forgot to enter a number."

Apocolypse2005 · March 25th, 2011, 04:49 PM

Quote:

Originally Posted by NovicePGM2011

This wouldn't work because we are talking about numbers not strings.
Because the MaskedTextBox is set to collect phone number.

I get the following error message.

IsEmpty is not a member of string.

Any other ideas?

Thanks Again

PGM

IsNullOrEmpty . . . . . ring any bells?

Plus your not looking at numbers, your looking at strings, regardless of the input data! Your checking whether the input is empty or not, then you check whether a number was entered, then you check the min max and all your other validations!

The Property of the maskedtextbox which holds the input is called .Text am I correct, then if I am correct surely the data type of said property is a string! The data type doesnt change dynamically with the input otherwise it would have data type object!