c# convert a string hex to ascii ? string reading from a csv file -


i'm trying in c# , visual studio express convert long string of chars contains hex data names in ascii words

example : file column read contain string

4e 4f 54 49 46 59 .................. (continue)

that means in asci "notify"

my program getting exception when method tohex try convert this.

why appear exception? caused char of space between each 2 chars of hex ascii values?

a first chance exception of type 'system.formatexception' occurred in mscorlib.dll first chance exception of type
'system.reflection.targetinvocationexception' occurred in mscorlib.dll first chance exception of type
'system.reflection.targetinvocationexception' occurred in mscorlib.dll

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.windows; using system.windows.controls; using system.windows.data; using system.windows.documents; using system.windows.input; using system.windows.media; using system.windows.media.imaging; using system.windows.navigation; using system.windows.shapes; using system.collections.generic; using system.diagnostics; using system.io; using system.linq; using system.text; using system.io; using lumenworks.framework.io; using lumenworks.framework.io.csv;  //main class namespace wpfapplication2 {     public partial class mainwindow : window     {         public string firstname { get; set; }          public mainwindow()         {             initializecomponent();             converttrace.hexutf8toasci();         }     }      //convert service classe     public class converttrace     {         public static string output;         public static string fine;         /*this method convert string contain hex spaced couples of chars asci readable string*/          public static string tohex(string hexstring)         {             byte[] dbytes = enumerable.range(0, hexstring.length).where(x => x % 2 == 0).select(x => convert.tobyte(hexstring.substring(x, 2), 16)).toarray();              output = system.text.encoding.ascii.getstring(dbytes);             return output;         }          public static void hexutf8toasci()         {             // open file "data.csv" csv file headers             using (csvreader csv = new csvreader(new streamreader("test3pulito.csv"), true))             {                 int fieldcount = csv.fieldcount;                 string[] headers = csv.getfieldheaders();                 while (csv.readnextrecord())                 {                     (int = 0; < fieldcount; i++)                     {                         string line2 = null;                         int line_number2 = 0;                         using (streamwriter writer2 = new streamwriter("test3new.csv"))                         {                             system.text.utf8encoding encoding;                             byte[] dbytes;                             string asciiresult;                             string utf8result;                             string corretto;                             string originale;                             string risultato;                             line_number2++;                             //here check column of file string convert                             if (i>7)                             {                                 originale = csv[i];                                 console.writeline(originale + "\r");                                 /*here call convert method*/                                 corretto = tohex(originale);                                 console.writeline(corretto + "\r");**                             }                         }                     }                 }             }         }     } }

you had right idea convert hex bytes actual bytes approach doesn't work. assuming you're passing in sequence of valid hex bytes space separated, in tohex() method:

var hexbytes = "4e 4f 54 49 46 59"; var bytes = hexbytes.split(' ')     .select(hb => convert.tobyte(hb, 16)) // converts string -> byte using base 16     .toarray(); var asciistr = system.text.encoding.ascii.getstring(bytes);

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