ASP.NET FileUpload Not working

The issue is very straightforward. Two days ago everything was working just fine but today, my FileUpload asp control doesn't work. I've made several researches but I haven't seen a code or explanation that solves my problem. This is the code I have.

I will summarize, If you need more code just ask it, I will provide it.

HTML:

<td style="text-align: left;"><asp:FileUpload id="FileUpload1" runat="server" /></td>

The FileUpload is inside a table as you can see nothing more to explain. (I am not using AJAX since I saw that the FileUpload doesn't work with AJAX without some code).

Vb.net:

ruta = ConfigurationManager.AppSettings.Get("RutaFotosDirecciones").ToString()



    id_foto = (DateTime.Now - New DateTime(1970, 1, 1)).TotalMilliseconds / 1000
    Dim path As String = Server.MapPath(ruta)
    Dim fileOK As Boolean = False
    If FileUpload1.HasFile Then
        Dim fileExtension As String
        fileExtension = System.IO.Path. _
            GetExtension(FileUpload1.FileName).ToLower()
        Dim allowedExtensions As String() = _
            {".jpg", ".jpeg", ".png", ".gif"}
        For i As Integer = 0 To allowedExtensions.Length - 1
            If fileExtension = allowedExtensions(i) Then
                fileOK = True
            End If
        Next
        If fileOK Then
            Try
                FileUpload1.PostedFile.SaveAs(path & id_foto & fileExtension)
            Catch ex As Exception
            End Try
        End If
    End If

I am using the Web.config file to set up my path.

The FileUpload1.HasFIle returns false and doesn't enter the if.

Thanks in advance.