Csharp file read and write

Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Submit and view feedback for This product This page. Inserting text in-place within the file is a costly operation, requiring all subsequent data to be shifted in memory.

You can use System. GetTempFileName for this purpose. Read the existing file into the temporary file, making necessary changes. Use StreamReader to read from the old file, and StreamWriter to write to the new file.

Overwrite the existing file with the temporary file. Improve this answer. Add a comment. There are two problems with writing to a line in a CSV file: Files are not line based.

Guffa Guffa k gold badges silver badges bronze badges. Doing that times, what performance aspect are we talking here? I'd disagree with 2 , when processing csv-file you can use ReadLine safely.

Not sure about different encodings though. Sinatr: You are mistaken. If you are changing the same file over and over, then you should naturally read it once, make all changes, and write it back when you are all done with it.

Guffa, oh, didn't though about line breaks as a part of content and seems have problems to read written properly. Then yes, you are right. I replace line breaks in strings with. MapPath "Twitter Overview Report1. Mahmoude Elghandour Mahmoude Elghandour 2, 1 1 gold badge 20 20 silver badges 27 27 bronze badges. The StreamWriter class inherits from the abstract class TextWriter that represents a writer, which can write a series of character.

Clears all buffers for the current writer and causes any buffered data to be written to the underlying stream. Writes the text representation of a Boolean value to the text string or stream.

Inherited from TextWriter. Raja Biswas. Previous Page. Next Page. Live Demo. Useful Video Courses. More Detail. The Beginner's Guide to C 24 Lectures 2.

Previous Page Print Page. Save Close. FileMode The FileMode enumerator defines various methods for opening files. Reading from and Writing into Text files It involves reading from and writing into text files.