//find all comment objects in project
DMObjectsFinder oFinder = new DMObjectsFinder(m_oTestProject);
Comment[] arrComments = oFinder.GetStorableObjects(null).OfType<Comment>().ToArray();

//Work on all found comments
foreach (Comment oComment in arrComments)
{
    Console.WriteLine("--- New comment found ---\n");

    //Write to console needed information about comment
    Console.WriteLine(
        "Author: {0}\nContent: {1}\nAnswer: {2}\n Page name: {3}\n",
        oComment.Author,
        oComment.Contents.GetAsString(),
        oComment.Answer,
        oComment.Page.Name);

    //change the state of comment
    oComment.ReviewState = Comment.Enums.ReviewStateType.Accepted;
}