C # Write Data to notepad and read it from notepad

Code

Using System. IO;

// Write
Streamwriter SW =   New Streamwriter ( @" C: \ temp123.txt " );
Sw. writeline ( " ---------------- Hello ---------------- " );
Sw. writeline ( " Content " );
Sw. writeline ( " ---------------- Hello ---------------- " );
Sw. Flush ();
Sw. Close ();

// Read
system. io. streamreader st;
st = New system. io. streamreader ( @ " C: \ temp123.txt " , system. text. encoding. utf8); // UTF-8 encoding
This . textbox1.text = St. readtoend ();

Streamwriter Sw = new streamwriter (@ "C: \ temp123.txt", true );
If the parameter is true, new data is written.
If it is set to false, the following data overwrites the front edge.