SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-delete-blog-posts

DeleteSingleBlogPostNativeAPI.cs

using System;
using System.Linq;
using Telerik.Sitefinity.Blogs.Model;
using Telerik.Sitefinity.Modules.Blogs;

namespace SitefinityWebApp
{
    public class DeleteSingleBlogPostNativeAPI
    {
        private void DeleteBlogPostNativeAPI(Guid masterBlogPostId)
        {
            BlogsManager manager = BlogsManager.GetManager();

            //Get the master version of the blog post. 
            BlogPost master = manager.GetBlogPosts().Where(b => b.Id == masterBlogPostId).SingleOrDefault();

            if (master != null)
            {
                //Mark the blog post to be deleted. 
                manager.DeleteBlogPost(master);

                //Save the changes. 
                manager.SaveChanges();
            }
        }
    }
}