Hello Zeeshan Muhammad,
Unfortunately this is not possible out-of-the-box.
The HtmlPlaceholder uses an IFrame displayed on top of the Silverlight application and it has all its limitations. The memory stream can be transferred to some JavaScript code that will execute it in the IFrame but I am not aware of a way to display a pdf from memory (byte array).
Greetings,
Miroslav
the Telerik team
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