Recruiter called me for an interview and told me that there will be two rounds of technical interview. And next day I get the link of first round, the round was easy just basics. And similary for 2nd round which you can say is managerial round that was on .NET jQuery and everything I mentioned in resume. The level of interviews are easy. I had cleared all the rounds and recruiter told me I will be receiving the offer letter next week.

After that, I had tried to reach her...she is not responding and no offer letter is received by me.

Just a bad experience. If you are selecting a candidate then provide him with the letter.

We covered the basics of .NET and jQuery.