When streamwrite writes ASCII text files, the processing of converting Chinese characters into question marks

Streamwriter Sw = new streamwriter ("C: \ x.txt", false, system. Text. encoding. ASCII );
Sw. Write ("dry dd is ");
Sw. Close ();
In the text file written above, Chinese will become a question mark.

The solution is to change the first sentence:
Streamwriter Sw = new streamwriter ("C: \ x.txt", false, system. Text. encoding. Default );

Note: When writing a text file separated by commas (,) in CSV format, it must be an ASCII file to be read correctly. The default value is streamwriter Sw = new streamwriter ("C: \ x.txt ") the generated file is in utf8 format.