How to get ckeditor textarea value using jquery?

No need for jQuery CKEditor has its own method to get data from converted textarea:

var desc = CKEDITOR.instances['DSC'].getData();

OR:

var desc = CKEDITOR.instances.DSC.getData();

Use id attibute in textarea and use that id in CKeditor instead of textarea's name check bellow

<textarea name="textareaname" id="textarea-id"></textarea>
CKEDITOR.replace( 'textarea-id');//use id not name//
var ckValue = CKEDITOR.instances["textarea-id"].getData(); or
var ckValue = CKEDITOR.instances.textarea-id.getData();