DROP ENDPOINT sql_endpoint;
GO

CREATE ENDPOINT sql_endpoint 
STATE = STARTED
AS HTTP(
   PATH = '/sql', 
   AUTHENTICATION = (INTEGRATED ), 
   PORTS = ( CLEAR ), 
   SITE = 'SERVER'
   )
FOR SOAP (
   WEBMETHOD 'GetSqlInfo' 
            (name='master.dbo.xp_msver', 
             SCHEMA=STANDARD ),
   WEBMETHOD 'DayAsNumber' 
            (name='master.sys.fn_MSdayasnumber'),
   WSDL = DEFAULT,
   SCHEMA = STANDARD,
   DATABASE = 'master',
   NAMESPACE = 'http://tempUri.org/'
   ); 
GO

       [WebMethod]
        public System.Data.DataSet GetDataTable()
        {            
        string strSelect = "Select * from extended";
        SqlConnection myConnection = new SqlConnection("Persist Security Info=True;Integrated Security=SSPI;Initial Catalog=Incom;server=(local)");
        SqlDataAdapter myCommand = new SqlDataAdapter(strSelect, myConnection);
        System.Data.DataSet ds = new System.Data.DataSet();
        myCommand.Fill(ds, "Example1");
        return ds;
        }

SqlDataAdapter ad = new SqlDataAdapter("Select table_name FROM information_schema.tables;", sql);

K>Вот как раз про пункты 4,5 поподробней плз

mywebservice.[название серивиса] webser =new mywebservice.[название серивиса]();

webser.mywebservice_method();

L>mywebservice.[название серивиса] webser =new mywebservice.[название серивиса]();
L>webser.mywebservice_method();
L>

public DataSet GetTablesList(string Base_Name)
    {
        SqlConnection sql = new SqlConnection("Persist Security Info=True;Integrated Security=SSPI;Initial Catalog=" + Base_Name + ";server=(local)");
        SqlDataAdapter ad = new SqlDataAdapter("Select table_name FROM information_schema.tables;", sql);
        DataSet ds = new DataSet();
        ad.Fill(ds);
        return ds;
    }

            string bds = "test_bd";
            localhost.GetTableListCompletedEventArgs getlst = new localhost.GetDataTableCompletedEventArgs(bds);

string bds = "test_bd";
            localhost.GetDataTableCompletedEventHandler getlst = new localhost.GetDataTableCompletedEventHandler(bds);