For Visual Basic 2012: Write a program that reads social security number and pri

Question

For Visual Basic 2012: Write a program that reads social security number and print last 4 digits if first digit is either 2 or 3.

I got this far, but have no idea what to write so that only the last four numbers become visible, when only 2&3 are used...right now I can use anynumber and something will pop up. Also I am using 2 textboxes and a button. What sort of mindset should I be thinking when trying to figure out a problem of this sort. A solution to the problem would be appreciated along with an explanation of the use of language.

Public Class Form1

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim number As String
If IsNumeric(TextBox1.Text) Then
number = CStr(TextBox1.Text)
If IsNumeric(2 Or 3) Then
TextBox2.Text = 638
End If
ElseIf
TextBox2.Text = "This is wrong SS#"
End If
End Sub
End Class

Explanation / Answer

public static boolean checkSSN(String social) {           boolean valid = false;           // 9 digits and 2 hyphens. First three characters, 5 and 6, and 8, 9,           // 10, 11 are digits              // Check that the length is valid           if (social.length() == 11) {               valid = true;           } else {               valid = false;           }              // Check that the characters are valid           // Valid as digits           char index0 = social.charAt(0);           char index1 = social.charAt(1);           char index2 = social.charAt(2);           char index4 = social.charAt(4);           char index5 = social.charAt(5);           char index7 = social.charAt(7);           char index8 = social.charAt(8);           char index9 = social.charAt(9);           char index10 = social.charAt(10);           // Valid as hyphen           char index3 = social.charAt(3);           char index6 = social.charAt(6);              if (Character.isDigit(index0) && Character.isDigit(index1)                   && Character.isDigit(index2) && Character.isDigit(index4)                   && Character.isDigit(index5) && Character.isDigit(index7)                   && Character.isDigit(index8) && Character.isDigit(index9)                   && Character.isDigit(index10)) {               valid = true;           }            else               valid = false;              if (index3 == '-' && index6 == '-') {                   valid = true;           }           else               valid = false;           return valid;       }

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