Hello Shailendra,
Most probably you have not assigned the comment to the blog post (with status Live) . I am sending you sample code that illustrates how to get the first blog post and crate comment for it. Then get the comment for this post.
I also attached a short video that illustrates how the code works and create this comment without issues, then the comments are updated from 1 to 2 - in the code check and at the backend UI.
Best wishes,
Ivan Dimitrov
the Telerik team
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