Have you used "Story Telling" technique at the start of presentation?

personally, if I have a related story to my topic I will use it as a kind of hook to grab  audions attintion  

Yes did for couple of presentation and learned that story must be short and relevant to content of presentation to bring audience attention.

Firstly,i introduce that why I am here?after that according to my presentation i provide some interested information about my deal.

yes, I have given lot of presentaions and its always very good to give a backdrop of usefullness of upcoming content. its like create a need to listen to you in advance