Hi Manish Agarwal,
Let me explain you how the html placeholder control works.
It is a DIV element positioned above the whole Silverlight application. This DIV elements is populated with the html string you are giving it to it. The only thing that the HtmlPlaceholder do to this DIV element is to position it correctly as part from the Silverlight layout. It will not apply any formatting to the HTML string you are trying to display.
So the answer to your questions is that if the HTML you want to display is wrapping - your text will wrap, else it will not. We are not doing any formatting to the string you are displaying.
Please check this demo to see how the html is displayed
- you will see that it will wrap by default.
I hope this is making the things more clear. Let us know if you have any other questions.
the Telerik team