C Form

Hello,

My company sales software, accordingly i have below mentioned query.

Is there any rule (our registered office is in Delhi) that we have to deposit security money with sales tax department for issuing C Form to our creditors?

We also purchase promotion material like T-Shirts, CD's, Brochures and other items what we can give as gift (like cricket kits) etc. can we issue & take benefit of C Form on this purchase?