i have problem about that( Keyword not supported: 'datasource').

com = new SqlCommand();
           con = new SqlConnection(stcon);//problem here
           com.Connection = con;
           com.CommandText = "insert into client(name)values(@a)";
           com.Parameters.AddWithValue("@",name);
           try
           {
               con.Open();
               int i = com.ExecuteNonQuery();
               if (i>0)
                   con.Close();
           }
           catch(Exception ex)
           {
               throw ex;
           }