Validation By Function ASP.Net

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<%@ Page Language=VB Debug=true %>

Sub Answer_ServerValidation(source As object, E As ServerValidateEventArgs)
    If  E.Value = CLng(E.Value) Then
        If E.Value Mod 2 = 0 Then
            If E.Value > 0 Then
                E.IsValid = True
            Else
                E.IsValid = False
            End If
        Else
            E.IsValid = False
        End If
    Else
        E.IsValid = False
    End If
End Sub



Validating Against a Positive Even Whole Number using the CustomValidator Control





Enter a Positive, Even, Whole Number:


    id="custom9"
    controltovalidate="txtAnswer"
    OnServerValidate="Answer_ServerValidation"
    display="Dynamic"
    font-name="Verdana"
    font-bold="True"
    font-size="10pt"
    runat="server">
    
Incorrect answer please try again!




    id="butOK"
    text="OK"
    type="Submit"
    runat="server"
/>