Vb code for validating textbox
Then a combination of 'Shift' key and 'Number' keys (which denotes Symbols) also not needed. Hence all these are included in the Text Box declaration itself which produces the desired result. Key Code for 'Space' Key is '32' which is also not needed. ") Try ' If something bad was entered delete the last character obj Txt Box.
Length 1, 1) Catch ex As Exception End Try End If End If End Sub Private Sub Text Box1_Key Down(By Val sender As Object, By Val e As System. I'm not trying to do anything to invovled, just have a textbox that takes numeric value from 1 to 10. I don't want it to take a string or any number above 10. Key Press '97 - 122 = Ascii codes for simple letters '65 - 90 = Ascii codes for capital letters '48 - 57 = Ascii codes for numbers If Asc(e. White End If End If End Sub End Module Private Sub Form1_Load(By Val sender As System. Only_Email) End Sub Private Sub Text Box1_Key Press(sender As System. Handled = True End If End Sub Public Sub Not Null_Leave(By Val sender As Object, By Val e As System.
Focus() End If End Sub Public Sub Email_Leave(By Val sender As Object, By Val e As System.
Handled Stringto Integer Direct Cast(sender, Text Box). With the "-" character you can change the integer from positive to negative and back again.
Length End If End Sub Then whenever the user enters text it evaluates the string and only returns numeric values that are within the bounds of a standard Integer.
Property Changed Public Sub On Property Change(By Val e As Property Changed Event Args) If Not Property Changed Event Is Nothing Then Raise Event Property Changed(Me, e) End If End Sub End Class Public With Events _Your Variable as New Properties Public Sub New() Initialize Component() With Your Text Box . This may be too late, but for other new blood on VB out there, here's something simple. Regular Expressions Module Module1 Public Enum Validation Type Only_Numbers = 1 Only_Characters = 2 Not_Null = 3 Only_Email = 4 Phone_Number = 5 End Enum Public Sub Assign Validation(By Ref CTRL As Windows. Text Box, By Val Validation_Type As Validation Type) Dim txt As Windows. Text Box = CTRL Select Case Validation_Type Case Validation Type. Key Press, Address Of number_Leave Case Validation Type. Key Press, Address Of OCHAR_Leave Case Validation Type. Leave, Address Of Not Null_Leave Case Validation Type. Leave, Address Of Email_Leave Case Validation Type. Key Press, Address Of Phonenumber_Leave End Select End Sub Public Sub number_Leave(By Val sender As Object, By Val e As System.
Count(Function(c) c = ".") Dim ch(10) As Char Dim len As Integer len = Text Box1. (Note this will need a separate property per Text Box) First create the property: Public Class Properties Implement INotify Property Changed Private _Variable as Integer Public Property Your Property as Object get Return _Variable end get set(value as Object) _Variable = value. To Integer 'I will give the To Integer extension code later end set end property Public Event Property Changed As Property Changed Event Handler Implements INotify Property Changed. Data Context = _Your Variable End With End Sub _ Public Function to Integer(Of T)(By Ref X As T, Optional I As Integer = 0) As Integer Dim S As String = X. Empty Dim Return Int As Integer Dim Parsed As Byte For Each Character In S. Meaning that if the operator entered "-1w3" after focus changes it will return as "-13" automatically.
Empty Dim Return Int As Integer Dim Parsed As Integer For Each Character In s. EDIT: I found another method that can work if you use properties in your code. Parse(S) End If Catch Dim result As String = String. To String With all these combined whenever they type something into the box it will act as if it were a textbox but when they change focus the To Integer extension will set the value as an integer into the property and return it to the textbox.