Validation Check Involving ASCII?

Mar 14, 2012

i'm new to this site and i'm hoping there's someone out there that can help me with this problem. I'm doing a course in visual basic 2010 and having real trouble understanding some aspects of it. Here goes -

I need to do a validation check on a users inputed string. The users input is called Test_data and it needs to be exactly 10 characters long and must only use the letters " a " to " f "

I know to check that the string is exactly 10 characters long by the Len function, and i have that working.BUT - how do i check whether the users inputed string uses the letters a to f ? I thought it would involve something to do with ASCII, but i would have no idea how to form a validation check using ASCII.

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I am trying to validate a textbox by checking the ASCII values on PreviewKeyDown event of the textbox.This method woorked fine with WinForms using vb.NET.The problem comes wen I use it in WPF.Is there a better method of carrying out validation of textbox in WPF forms ??

[Code]...

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Public Class Funktionen
Private Sub FunktionenBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FunktionenBindingNavigatorSaveItem.Click
Me.Validate()[code]......

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± 3
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[Code]...

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Here is the incomming string:

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and here is the expected output:

[code]...

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[Code]...

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I currently have the following working[code]...

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[Code]....

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Here is the part of Code that I wrote for Delegates

Code:

'Form 1 is BLINDHELPER_SIGNIN
'form 2 is BLINDHELPER_USER

' I have defined these at Module1

Public Delegate Sub DeleToManageTabs(ByVal tb As TabControl)
Public Sub manage_Tabs(ByVal tab As TabControl)
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[code]....

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Code:

Imports System.Threading
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Module Module1

[CODE]...

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[Code] .....

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Private Sub Form_Load()
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[Code]...

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[Code]...

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Server:

CODE:

Client:

CODE:

just for ping purposes.. :)

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Code:
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[code]....

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