how to show liked link with image using fb-like button in asp.net

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ASP.NET

hello friends

i am facing a problem since 3 days.

I have fb-like button on my webpage, when i click on it, it posts a message on facebook. but doesnt show given image in that like post.

I refer some posts and got answers that add the open graph meta tags, so that the fb will show the images.
But its not working

I added following meta tags than also i failed.

<meta property="og:title" content="FMTest6 Play Floa: http://tinyurl.com/827adl9" />
<meta property="og:type" content="activity" />
<meta property="og:url" content="http://floa.staging.perpetuating.com" />
<meta property="og:image" content="http://floa.staging.perpetuating.com/Floas/FMTest6/mojopreview.png" />
<meta property="og:site_name" content="Floa" />

I also tried to debug my page using facebook/lint tool, in that tool the page shows image as passed, but while clicking on fb-like on my webpage, it doesnt show the given image, instead it shows another image from my webpage
Help needed to fix this.