Problem in inserting data using Silverlight

Hell to every body on Vbforums,
By using Follwoing code i tried to insert data in database in silverlight

Code:

---

Service1Client webservice = new Service1Client();
            //ServiceReference1Client  webservice = new ();
            bool b;
            b = webservice.InsertVoteAsync ("Abc", DateTime.Now.Date);

---

and the service code is

Code:

---

[OperationContract]
        public bool InsertVote1(String vote, DateTime  dt)
      {
          bool Inserted = false;
          Conn = new SqlConnection("Data Source=xyz-PC;Initial Catalog=Voting;User Id=sa;Password=sa;Integrated Security=SSPI");
          Cmd = new SqlCommand();
          Conn.Open();
          Cmd.Connection = Conn;
          Cmd.CommandText = "insert into votes values(vote,dt)" ;


          int ins = Cmd.ExecuteNonQuery();
          if (ins > 0)
          {
              Inserted = true;
          }

          Conn.Close();
          return Inserted;
      }

---

but gives me these errors


Error 1 The best overloaded method match for 'VotingPanel.ServiceReference1.Service1Client.InsertVoteAsync(System.DateTime, string)' has some invalid arguments ........................



Error 2 Argument '1': cannot convert from 'string' to 'System.DateTime' ...............................


Error 3 Argument '2': cannot convert from 'System.DateTime' to 'string'


any one can help me

i added following lines of code too

Code:

---

  private void  InsertVoteCompleted(Object sender,  System.ComponentModel.AsyncCompletedEventArgs e)
    {
      // lblMsg.Text = "Added Successfully!" ;

    }

---

but did not find the solution uptill now