c# - LIKE command Mysql -

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can tell me wrong command? error. use c# , mysql database. 

 public static dataset getinstructorlistsearchemail(string instemail)         {             db.connecttodb();             db.dbopen();          dataset ds = new dataset();         try         {             string comtext = "select * instructor instructor_email %instemail";             mysqlcommand com = new mysqlcommand(comtext, db.conn);             com.parameters.add("instemail", mysqldbtype.varchar, 200).value = instemail;             mysqldataadapter adapter = new mysqldataadapter(com);             adapter.fill(ds);

seeing used cmd parameter need modify query string accept parameters changing 

string comtext = "select * instructor instructor_email @instemail"; com.parameters.addwithvalue("@instemail", "%" + instemail);

or work using single quotes , drop parameter think using parameters better.

string comtext = "select * instructor instructor_email '%" + instemail + "'";

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