Value, Description. URL, Specifies the URL of the document to embed in the iframe. Possible values: An absolute URL - points to another web site (like  Here I will explain how to open pdf file in web browser in asp.net using C# and VB.NET. Download Sample Code Attached. Protected by But I want open pdf file in panel using choose file control instead of iframe src in asp.net using c#. I have showreport.aspx as iframe src, i generate pdf from crystal report pdf in not displayed inside iframe, it's always as me to save/download. http://view.officeapps.live.com/op/view.aspx?src=[OFFICE_FILE_URL]