C# FileStream creating new .csv file but not writing to it -

hi i'm trying write data .csv file. code creating new file isn't writing it. here shorter version of code name, age, , sex variables predetermined. in actual application these variables come textboxes (i have made sure data textboxes filling these variables using messagebox).

here code:

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.io;  namespace consoleapp1 {     class program     {         static void main(string[] args)         {             string filepath = "c:\\users\\jamie\\desktop\\test.csv";             string name = "jamie";             int age = 69;             string sex = "male";              if (!(file.exists(filepath)))             {                 filestream fs = new filestream(filepath, filemode.createnew, fileaccess.write);                 if (fs.canwrite)                 {                     string columntitles = "name,age,sex\n";                     fs.write(encoding.ascii.getbytes(columntitles), 0, 0);                     string input = name + "," + age + "," + sex + "\n";                     fs.write(encoding.ascii.getbytes(input), 0, 0);                     fs.flush();                     fs.close();                 }             }             else             {                 filestream fs = new filestream(filepath, filemode.append, fileaccess.write);                 if (fs.canwrite)                 {                     if (new fileinfo(filepath).length == 0)                     {                         string columntitles = "name,age,sex\n";                         fs.write(encoding.ascii.getbytes(columntitles), 0, 0);                     }                     string input = name + "," + age + "," + sex + "\n";                     fs.write(encoding.ascii.getbytes(input), 0, 0);                     fs.flush();                     fs.close();                 }             }         }     } } 

use following code write :

   fs.write(encoding.ascii.getbytes(input), 0, asciiencoding.ascii.getbytecount(input)); 

third argument of filestream write method need know maximum numbers of bytes write. specifying 0 byte maximum byte write in case it's not writing file.

apart error, suggest use using statement filestream implements idisposable interface , take care of flusing stream goes out of scope of using statement.

using(filestream fs = new filestream(filepath, filemode.createnew, fileaccess.write)) {     if (fs.canwrite)         {             string columntitles = "name,age,sex\n";             fs.write(encoding.ascii.getbytes(columntitles), 0, 0);             string input = name + "," + age + "," + sex + "\n";             fs.write(encoding.ascii.getbytes(input), 0, asciiencoding.ascii.getbytecount(input));         } }