The best replacement for streamwriter is textwriter.

The best alternatives to streamwriter are rated as following:
★★★★★  textwriter
★★★★★  stringwriter
★★★★  binarywriter
★★★  file.writealltext
★★★  stringbuilder
★★  filestream
★★  xmlwriter
★  appendalltext
★  file writealltext

Your alternative for streamwriter is not listed? Suggest!
Speaking about streamwriter, one probably shouldn't forget about append.

Other search terms related to streamwriter and their ratings are:
★★★★★ append
★★★ filestream
★★ memorystream
You have in mind a companion for streamwriter and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of streamwriter in all years. Click on graph for more.
streamwriter
textwriter
stringwriter