Dear Hans,
I found a command \determinenoflines by googling.
I made a MWE as following. It is working well.
But I have to write the paragraph twice for couning.
Is there a better way?
Thank you again.
Best regards,
Dalyoung
%%%%%%%
\def\StartHide{\doifmode{hideSolution}{\starteffect[hidden]}}
\def\StopHide{\doifmode{hideSolution}{\stopeffect\blank[\the\noflines*line +
\the\noflines*halfline]}}
\enablemode[hideSolution]
\starttext
The first line.
\hrule
\StartHide
\samplefile{knuth}
\determinenoflines{\samplefile{knuth}}
\StopHide
\hrule
The second line.
\hrule
\StartHide
\samplefile{ward}
\determinenoflines{\samplefile{ward}}
\StopHide
\hrule
The last line.
\stoptext
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