c# - Substring for thai language -

i facing interesting problem. following string want take sub string.

  1¨Ñ§ËÇÑ´1xxxxxxxx                 

index 0-2 (length 3) province id index 3-35 (length 32) province name in thai.

when try take sub string province following

string line = "1¨Ñ§ËÇÑ´1xxxxxxxx                "; line.substring(3,32).trim(); 

this shows me error following

index , length must refer location within string. 

keep in mind when debug code line total length shows me 33 should 35. , province sub string shown 30.

following code...

        using (streamreader streamreader = new streamreader("file06.txt"))         {             console.writeline(".................. content of " + file.name + "..............");             string codeofprovince, nameofprovince, line;             while ((line = streamreader.readline()) != null)             {                 codeofprovince = line.substring(0, 3).trim();                 nameofprovince = line.substring(3,32).trim();                 console.writeline("codeofprovince {0}, nameofprovince {1}", codeofprovince , nameofprovince );             }             console.writeline("..............................................................");             console.writeline(); 

i'm sure out , file has following data

  1¨Ñ§ËÇÑ´1xxxxxxxx                   2¨Ñ§ËÇÑ´2xxxxxxxx                 

ok got answer. reading file ansi encoding. when changed file unicode encoding started working.