//

//

//DRF,FRD

//

string vText = @"ABCD,BDAC,DRF,FRD,CADB,CAADB,XB" ;

List < string > vResults = new List < string > ();

string [] vWords = vText . Split( "," . ToCharArray(),  

    StringSplitOptions . RemoveEmptyEntries);

foreach ( string vWord in vWords)

{  

    char [] vChars = vWord . ToUpper() . ToCharArray();

    Array . Sort(vChars);

    string T = new string (vChars);

    bool vExists = false ;

    for ( int i = 0 ; i < vResults . Count; i ++ )

        if (T + "=" == vResults[i] . Substring( 0 , T . Length + 1 ))

       {

           vResults[i] += "," + vWord;

           vExists = true ;

            break ;

       }

    if ( ! vExists) vResults . Add(T + "=" + vWord);

}

int vGroup = 0 ;

foreach ( string vResult in vResults)

{

    if (vResult . IndexOf( ',' ) > 0 )

   {

       vGroup ++ ;

       textBox1 . AppendText( string . Format( "{0}{1}\r\n" ,

           vGroup, vResult . Substring(vResult . IndexOf( '=' ) + 1 )));

   }

}