Is RegularExpressionValidator.IsValid ok to use server side?

I've tried this method in my code behind to try and validate that the Fileupload control has a file or not. I get the error message the the event "Server Validate" cannot be found. Can anyone tell why? Thanks.

Public Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
       

' Get file name

        Dim uploadAvatar As FileUpload = DirectCast(AdvertisementForm.FindControl("uploadAvatar"), FileUpload)

        Dim UploadFileName As String = uploadAvatar.PostedFile.FileName

        If UploadFileName = "" Then
            ' There is no file selected
            args.IsValid = False
        Else
            Dim Extension As String = UploadFileName.Substring(UploadFileName.L

Hi,
 I am using a IIS 7.5 on Windows 7. I have a simple application that uses System.Net.WebRequest to POST data to another URL (in fact, the server side URL is on my local computer and it is hosted in IIS 7.5).

  1.  The problem is the server does not save data from client although on the client side codes when I debug and I see the OK message return from the code line

   response.StatusDescription; // this has value of "OK"

2. How can I debug the server code side where to receive the request from client side who posts the data ?

The following is the codes for client who posts data using System.Net.WebRequest, and codes for server side who received posted data to save to database.

Client side codes: // also run on my local computer

public string PostIntegrationXml(XmlDocument xmlSubmitDoc)

        {

    &nbs

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Hi

Could anyone give me an example how to call Server Side Function from javascript and then I want to call that javascript function on Button OnClick () Event.

Thanks in Advance

Shabbir