c# - Selecing an overloaded method using 'Named arguments' -

i want use 'named arguments' feature parameter.

there 2 methods.

class temp {     public method(class1 param);     public method(class2 param); }; 

in case of above class, if want call method using 'named arguments'. can call method(param: 'some value'); , want give null in 'some value', when try this,

method(param:null); 

i see message

the call ambiguous between following methods or properties: 'method' , 'method'

then, realized these 2 (class1, class2) similar.

so when try cast this,

method((class1)param:null); 

i failed message below.

the name 'identifier' not exist in current context

so can 'cast' 'param' parameter?

thank you.

you this:

methodname(param: (class1)null) 

basically, need cast null given type, not parameter