Attribute not working correctly

See more:

C#

PDF

attributes

ASP.NET4

Hello, I wrote an application using C# VS 2010 that calls an PDF page from an internet location and displays it on an internal Adobe viewer in an IFrame. It seemed to work perfectly, but then I updated one of the PDF docs and it still calls the old one. I even deleted the file from the online folder and it still loads it. I restarted the program and it made no difference. I cannot understand why it does not see the new document by the same name. The complete code is below:

//Use this method to get the correct page name from the DB
string item = GetPdf(2);
        if (item == string.Empty)
        {
            ClientScriptManager script = Page.ClientScript;
            if (!script.IsClientScriptBlockRegistered(this.GetType(), "Alert"))
            {
                script.RegisterClientScriptBlock(this.GetType(), "Alert", "alert('Sorry, this document canot be found. ')", true);
                return;
            }
        }
//Add the items and location to the attribute list to pass to the reader
        else
        {
            pdfIframe.Attributes.Add("src", item);
        }

Any help appreciated. Thank You, Pat.

What I have tried:

I tried removing the old document completely. I restarted the program. I ran a stack trace. I used break points to at each step.