private string Win1251ToUTF8(string source)
{

Encoding utf8 = Encoding.GetEncoding("utf-8");
Encoding win1251 = Encoding.GetEncoding("windows-1251");

byte[] utf8Bytes = win1251.GetBytes(source);
byte[] win1251Bytes = Encoding.Convert(win1251, utf8, utf8Bytes);
source = win1251.GetString(win1251Bytes);
return source;

}