Hello every one .
i want to extend my center line upto view outBox for that i wrote one method in c# which is attached below,
firstly i wrote program its work fine as shown in fig 2 and attachment CentreLine2.
then i have done some simple modification but after that its not work as shown in fig 1 and attachment CentreLine.
can any one please help me.
i got solution, in drawing before performing any operation need to activate view.
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