van prefix is not in capital at beginning of sentence

Question

The answer to this question states that "van" prefix should be in capitals when it appears at the beginning of a sentence. But the code below typesets "van Dijk". How can I get "Van Dijk" when it appears at the beginning of a sentence?

\documentclass{scrartcl}            
\usepackage[style=authoryear,sorting=nyt,backend=biber,useprefix=false]{biblatex}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{dijk,
  author       = {van Dijk, A.},
  title        = {Some Nice Title},
  date         = 2015,
  publisher    = {P. Ublisher},
  location     = {Place},
}
\end{filecontents*}   
\bibliography{\jobname.bib}  

\renewbibmacro*{begentry}{\midsentence}

\makeatletter
\AtBeginDocument{\toggletrue{blx@useprefix}}
\makeatother

\begin{document}  
\textcite{dijk} not capitalising start of sentence
\printbibliography  
\end{document}

Answer 1

The \textcite command uses the standard capitalization; however the biblatex package provides \Textcite for use at the beginning of a sentence (section 3.7.2 of the manual).

\documentclass{scrartcl}            
\usepackage[style=authoryear,sorting=nyt,backend=biber,useprefix=false]{biblatex}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{dijk,
  author       = {van Dijk, A.},
  title        = {Some Nice Title},
  date         = 2015,
  publisher    = {P. Ublisher},
  location     = {Place},
}
\end{filecontents*}   
\bibliography{\jobname.bib}  

\renewbibmacro*{begentry}{\midsentence}

\makeatletter
\AtBeginDocument{\toggletrue{blx@useprefix}}
\makeatother

\begin{document}  
\Textcite{dijk} capitalising start of sentence
\printbibliography  
\end{document}