How to disable download option of pdf file in c# ?

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C#

PDF

Hi,
How to disable the pdf Toolbar because I don't want to give the download option to the Viewers.

I have used Iframe for showing Pdf File please find the following code

<iframe ID="iFrame2" runat="server" align="bottom" frameborder="2" name="iframe1" height="500" width="600" src="~/pdffiles/example.pdf"></iframe>

Please help me to disable the download option using c# i.e toolbar

Thanks
purna