C # encode a string for JSON Javascript

Public static string enquote (string S)
{
If (S = NULL | S. Length = 0)
{
Return "\"\"";
}
Char C;
Int I;
Int Len = S. length;
Stringbuilder sb = new stringbuilder (LEN + 4 );
String T;
 
SB. append ('"');
For (I = 0; I <Len; I + = 1)
{
C = s [I];
If (C = '\') | (C = '"') | (C = '> '))
{
SB. append ('\\');
SB. append (C );
}
Else if (C = '\ B ')
SB. append ("\ B ");
Else if (C = '\ t ')
SB. append ("\ t ");
Else if (C = '\ n ')
SB. append ("\ n ");
Else if (C = '\ F ')
SB. append ("\ f ");
Else if (C = '\ R ')
SB. append ("\ r ");
Else
{
If (C <'')
{
// T = "000" + integer. tohexstring (C );
String TMP = new string (C, 1 );
T = "000" + Int. parse (TMP, system. Globalization. numberstyles. hexnumber );
SB. append ("\ U" + T. substring (T. Length-4 ));
}
Else
{
SB. append (C );
}
}
}
SB. append ('"');
Return sb. tostring ();
}
 

 

It's public domain but the strange thing is that the zipfile is not linked from the json.org homepage, Anyway my point is that the function-while it might not be rocket science, still is too good to have to just be lying inside a strange zipfile.
What does it do? In encodes a string so it can be used inside a JSON expression. It is so useful to be able to be Alto send anything (HTML, special characters etc) inside the JSON string