ms word - DOCX: Field code that evaluates to empty string as field result -

i need insert field in word document evaluates empty string.

some ideas i've;

- set intersection: both sets have nothing in common , field result lead empty. - "".concats(""), leads "" 

can insert such kind of field code in office word document?

if want insert field empty string result use macrobutton field no caption points non-existing macro:

{ macrobutton nomacro } 

using openxml sdk, can create such button this:

var paragraph = new paragraph(     new run(new fieldchar { fieldchartype = fieldcharvalues.begin }),     new run(new fieldcode { space = spaceprocessingmodevalues.preserve,                              text = " macrobutton nomacro " }),     new run(new fieldchar() { fieldchartype = fieldcharvalues.end }));