types dataset

hi,
i creating project using typed dataset first time.
the datatier returns dataset of .xsd type webservice

//dsemps .xsd
public dsemps getdata()
  {
   string strsql = "select employeeid, lastname, firstname, title, titleofcourtesy, birthdate, hiredate, address, city, region, postalcode, country, homephone, extension, photo, notes, reportsto, photopath employees";
   string strconn = "server=localhost;" + "database=northwind;" + "integrated security=sspi;connect timeout=5";
   
   dsemps dsdata = new dsemps();

   using(sqldataadapter oda = new sqldataadapter(strsql, strconn))
   {
    oda.fill(dsdata, "employees");
    
    return dsdata;
   }
  }

here if use dataset below:
placing dot after dataset (i.e. dsdata) shows employees table , placing dot shows field names...
this far. problem in webservice returned dataset below, can not column names after dadata.employees.

//empdata datatier...
public empdata.dsemps getdata()
  {
   try
   {
    empdata.employees dc = new empdata.employees();

    return dc.getdata();  
   }

   catch
   {
    throw;
   }
  }

can see why case?
thanks

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