hi there Rakesh,

following are some of the best institutes for B.Tech through distance learning

Indira Gandhi National Open University,Delhi

Yashwantrao Chauhan Maharashtra open University,Nashik,Maharshtra

Sikkim Manipal University

IMT Distance and Open learning University

Maulana Azad National University, Hyderabad

HI Rakesh

honestly speaking the number of colleges offering correspondence education for textile engg. in india is very less here is my suggestion you can have a look at the this college.

But i would suggest you to see the option for a full time in campus study which will be beneficial for you i a lots of aspects.

Shivani College of IT and Management

Dilsukh Nagar, Hyderabad

GOOD LUCK!!