Set value of textarea in jQuery
$("textarea#ExampleMessage").val()
in jquery just a magic.
You should notice that textarea tag using inner html to display and not in value attribute just like input tag.
<textarea>blah blah</textarea><input type="text" value="blah blah"/>
You should use
$("textarea#ExampleMessage").html(result.exampleMessage)
or
$("textarea#ExampleMessage").text(result.exampleMessage)
depend on if you want to display it as html tags or plain text.