asp.net - array in tostring Convert type char to string -

i have code,but getting error.after change code.but wanted know correct.

 modifiedmessage = converttoisofromutf8(modifiedmessage, "iso8859-1", "utf-8");          char[] characters_to_removed_from_start = { ' ' };         modifiedmessage = modifiedmessage.trimstart(characters_to_removed_from_start);          string msg_arr = modifiedmessage.split(' ');          string keyword = msg_arr[0];          //linq         if (keyword != null)         {             string[] key = regex.split(msg_arr, @keyword).skip(0).toarray();           //  message_in = string.join(message_in,key);             message_in = string.join(msg_arr, key);              modifiedmessage="";          } 

those errors shown error 1 cannot implicitly convert type 'string[]' 'string'
error 2 cannot implicitly convert type 'char' 'string'

then change code this..(only changed code listed below)

 string msg_arr = modifiedmessage.split(' ').tostring();   string keyword = msg_arr[0].tostring(); 

i wanted know works correct ?

no, thats not correct, change

string msg_arr = modifiedmessage.split(' '); 

to

string[] msg_arr = modifiedmessage.split(' '); 

this resolve "error 1 cannot implicitly convert type 'string[]' 'string'"

and error 2 dissapears also