Custom Validation Control Of Image Not Firing?

Jul 18, 2010

I have this code:

protected void registerBtn_click(object s, EventArgs e)
{
bool agencyPictureActive = agencypicture.HasFile;
agencypictureValidator.Enabled = agencyPictureActive;
Page.Validate();
if (Page.IsValid)
{

and this control:

<asp:label runat="server">Logo</asp:label>
<asp:FileUpload id="agencypicture" runat="server"/>
<asp:CustomValidator id="agencypictureValidator"
ValidationGroup="userForm"
ControlToValidate="agencypicture"
ErrorMessage="some error msg" Text="*"
OnServerValidate="checkImageSizeValidate"
runat="server">
</asp:CustomValidator>

I want to validate and save the image along with other form value upon "registerBtn_click" , but the custom validation control of the image does not activate somehow... why?

This is my submit control:

<asp:LinkButton id="btnSubmit" OnClick="registerBtn_click"
ValidationGroup="userForm" Text="Submit" runat="server">
</asp:LinkButton>

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