Ignoring 1s and 0s in a TextBox

I'm new to Visual Basic express 2010 and I'm trying to figure out a tiny code to get my TextBox to ignore 1s and 0s and clear the TextBox.
This is what I have currently :

Code:

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If (txtPhoneNumber.Text) = ("1") Or ("0") Then
                    txtPhoneNumber.Text = ""
                    MessageBox.Show("Phone Numbers Must Not Contain 1s or 0s!", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                End If

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The current code doesn't work at all so I'm looking for something that will.

Thank you in advance for looking!

Try this code:

Code:

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if txtPhoneNumber.Text.Contains("0") OR txtPhoneNumber.Text.Contains("1") Then
                    txtPhoneNumber.Text = ""
                    MessageBox.Show("Phone Numbers Must Not Contain 1s or 0s!", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
                End If

---

The reason your code isn't working is because you are looking at the whole string. So if you were to type in just 1 and 0 into the box your code would work but if you did a bunch of numbers and then a 1 or 0 it would not work. That is because the random numbers plus the 1 or 0 does not equal just 1 or 0

Your current code is only checking if the text in the box contains only a 1 or a 0 so it would fail if there were 2 or more digits no matter where or how many 1s and/or 0s were there.

You could use the .IndexOf() to check if a string contains an instance of a character or string but I am not sure why you would want to filter out 1s and 0s from phone numbers as both are valid. For example my phone number has 2 0s in it. It is even possible that someones number is nothing but 1s and 0s and very likely that any given phone number will contain at least one 0 or 1 so you would be making it impossible to enter millions of valid phone numbers.

I'm making a Telephone Word Generator for a homework project and since 1 and 0 has no Letters I don't need them inputted.

Also gonna try your code waddle and let you know if it works :)

Thank You waddle it worked exactly as I was intending it to work !