String, substrings for commands in textbox

[Greenwood]

Hi all, I have a issue, a have a textbox which takes commands, the commands can be something like:

rp73{
rp36 {av 14, td 10} ,
td 35,
cc -1 1 -2
};

I have the code below so far and cant figure out how to make a command like the one below execute.

if (e.KeyChar == '\r')  

             {  

                 String command = tbCommand.Text.ToLower().Trim();  

    

                 if (command.Contains("="))  

                 {  

                     String[] ch = command.Split(new char[] { '=' });  

                     ch[0] = ch[0].Trim();  
  else 

                 {  

                   String[] ch = commande.Split(new char[] { ' ' });  

                   if (ch.Length == 2)

i give some commands in the text box then its executes the commands, something like turtle gaphics, i need to use the string format i think im really not familiar with strings. Any help pr advise thx