c# - How to output commas in CSV -

so output attributes csv, i'm using stringbuilder uses commas natural delimiter commas. problem when add string commas inside in string, it's splitting separate columns me. ex

temp.append("ab,cd,ef") giving me 3 separate columns. how output single column commas intact.

it's result of capture group

match = regex.match(amt, "^\"([\\d,]+),(\\d\\d\\d)\"$"); 

and did

amt = convert.tostring(match.groups[1].value) + convert.tostring(match.groups[2].value); 

so takes in 123,123,123,123 unknown number of commas , want output exact same thing last commas replaced period. it's still coming out

123 123 123 123 123

in separate columns

you need wrap entry in quote

temp.append("\"ab,cd,ed\""); 

updated after redited question

from saying wish convert 123,445,567,890 123,445,567.890 , want csv output work:

you still need wrap result in quotes need

amt = string.format("\"{0}.{1}\"", match.groups[1].value, match.groups[2].value); 

alternatively replace last ','

amt = new regex(",(?=\\d{3}\"$)").replace(x,"."); 

or without regex.

char[] y = amt.tochararray(); y[amt.lastindexof(",")] = '.'; amt = string(y);