Removing extra commas from string after using String.Join to convert array to string (C#) -

quick question here. i'm converting array string using string.join. small issue have that, in array index positions blank. example below:

array[1] = "firstcolumn" array[3] = "thirdcolumn" 

by using string.join(",", array);, i'll following:

firstcolumn,,thirdcolumn

note ,. how can remove commas string, or ideally not include blank indices when using string.join?

try :):

var res = string.join(",", array.where(s => !string.isnullorempty(s))); 

this join strings not null or "".