c# - Optional function parameter with default value by reference -

by automatic conversion of code written in vb.net c# have such situation in function declaration of vb.net:

private function dataarchiver(byval toplace string,                                 optional byval aextension string = ".7z",                                 optional byref createdname string = "") integer 

tool automatic conversion in c#:

private int dataarchiver(string toplace,                           string aextension = ".7z",                           ref string createdname = "") 

and of course don't work. keyword "ref" before last argument underlined red. why so? because string createdname may (and don't have be) generated in function , in case have passed out function. important code can work net framework 3.5.

any idea working in c# without reconcepting of vb.net program?

you have create overloaded methods (as have had before c# acquired optional parameter feature):

private int dataarchiver(string toplace, string aextension) {     string tempvar = "";     return dataarchiver(toplace, aextension, ref tempvar); }  private int dataarchiver(string toplace) {     string tempvar = "";     return dataarchiver(toplace, ".7z", ref tempvar); }  private int dataarchiver(string toplace, string aextension, ref string createdname) {     return 0; }