Hi Geetika.. Find below one of the sample format of the same... 21st August 2007 To Mr. Designation. Sub. – Warning Letter Mr. It has been observed that you have done some thing which is against the code of conduct, resulting in willful insubordination and gross negligence of duties, in your capacity as Designation. Not following teh code of conduct is a misconduct for which you are making yourself liable for necessary action. You are hereby warned to refrain from such activities; failure to do so shall invoke appropriate action. You are further advised to submit a written explanation on your unethical act as soon as you receive this letter or as soon as you resume duties. Kindly treat this as very urgent. For, Company name Name: Designation Regards, Amit Seth.