Can anyone help me in writing letter to my Ex Boss in postive manner.

Thanks

James,
Sure, James-- post a draft here, and we'll review it for latent antagonisms.
Dear Mr. XYZ,

How are you ? I hope you are fine/well.

I would like to sincerely thank you for your all support and help during the employment in your organisation. I want to thank you for the experience and stand me in high level position, which help i can get diligent position to success in my life.

Thank you for your all help.

Your sincerely

Harpreet Singh
Try out our live chat room.
Dear Mr. XYZ,
I would like to thank you sincerely for your all support and help during my employment with your organisation. Thank you for the experience you have afforded me and for your confidence in assigning me to a high-level position, which will serve me in good stead in attaining success in my career.
I am very grateful for all you have done for me.

Yours sincerely,

Harpreet Singh
This one is really good, thanks