How Do I Create Coding For Keypress?(Visual Basic 2012 Oop Method)

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I want to create a register form using visual studio 2012 and SQL server 2012.

the function i want is:

- if i type a number on the textbox for username the program will warn me that the username can only contain letter.

- in the password textbox if i type a letter the program will warn me that the password can only contain letter.

i heard that to do this is to use keypress function.

what is the coding for keypress to do a function like above?

Posted 12-May-15 17:14pm

asasql

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Sergey Alexandrovich Kryukov 12-May-15 23:35pm

The scope of the question is too general to be reasonable.
TextBox? Which one? Full type name, please.
The problem looks extremely simple, you just need to learn events. (I'm afraid you don't have a clue — "keypress function" sounds total gibberish.)
But it would be disgusting to try to answer for all possible application types and UI libraries. Tell us exactly what it is. The simplest way it to tell us exact type, for example, "System.Windows.Forms.TextBox". Or?...
—SA

2 solutions

Solution 1

Never do that! You are facilitating hacking. If you are the authentic owner of an account, you do not need this. If you are not, then you do not need this either.
in case of typo, just say "(un)successful log in, try again."

Posted 12-May-15 17:32pm

Peter Leow

Updated 12-May-15 21:34pm

v3

Comments

Sergey Alexandrovich Kryukov 13-May-15 0:45am

You are right. (Probably the message "successful log in, try again" is just the joke. :-) It looks like the inquirer wants to enforce extremely weak passwords.
My 5.
—SA

Peter Leow 13-May-15 3:33am

Thank you, SA. Actually, that was my typo.:D

Sergey Alexandrovich Kryukov 13-May-15 3:51am

I would remove () then. :-)
—SA

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Ralf Meier · Accepted Answer · 2015-05-12T19:56:00

I understand the following :
You want to create a kind of custom TextBox. For the understanding of this you can use the following code :

VB

    Public Class myTextBox
        Inherits System.Windows.Forms.TextBox
 
        Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)

            Dim Taste As Keys = e.KeyCode
            Select Case Taste
                Case Keys.Enter, Keys.Escape
                    'Input Complete 
                    e.Handled = True
                Case Else
                    Beep()
                    e.Handled = True
            End Select

        End Sub

        Protected Overrides Sub OnKeyPress(ByVal e As System.Windows.Forms.KeyPressEventArgs)

                 Dim Taste As Char = e.KeyChar
                 Select Case Taste
                     Case "0" To "9"
                         ' do something
                     Case "+"
                         ' do something
                     Case "-"
                         ' do something
                     Case ".", ","
                         ' do something
                 End Select

             e.Handled = True
        End Sub

end class

Inside the overrided Sub's you could do, what you imagine (or think what shall happen).
The Result is that you have you own "spezified" TextBox which inherits from the Standard-TextBox ...

Greetings
Ralf