C# Visual Studio Ex 2013 - HOW to disable automaticly replaces constants into strings? -

i have class static variable

public static string appdatasavingfolder = "";  [...]  string *appdatafolder* = environment.getfolderpath(environment.specialfolder.applicationdata); *appdatasavingfolder* = appdatafolder + @"\appfolder"; 

then in code use load xml file treeview

this.tvtaskstree.filepath = program.*appdatasavingfolder* + @"\list.xml"; 

but (i can't recognise when) vs replace string e.g

this.tvtaskstree.filepath = "c:\users\[user]\appdata\roaming\appfolder\list.xml";

so it's make error when program open in other computer out folder "c:\\users\\[user]".

how disable option (replacing) constants?