How to make an empty curve variable?

Hello everyone,

I 'm working with Grasshopper extension in Visual Studio and to be able to define an input curve I need to make an empty curve variable as reference. But I keep getting this error that there is no constructor for Curve which can get no arguments … . can somebody help me with that?



2020-10-15 18_59_22-PersianVAULT_2 - Microsoft Visual Studio

Curve boundary = null;
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