Basic SQL user database [closed]

public void AddClient(Client obj){
  try{
      using(System.Data.SQLite.SQLiteConnection conn = stock.db.SqlLiteConnection.getSQLLiteConnection()){
      System.Data.SQLite.SQLiteCommand cmd = conn.CreateCommand();
      string sql="insert into Client (email,firstName,lastName,telephone,address,city,state,zip,web) values(@email,@firstName,@lastName,@telephone,@address,@city,@state,@zip,@web)";
      cmd.CommandText = sql;
      cmd.Parameters.AddWithValue("@email", obj.Email);
      cmd.Parameters.AddWithValue("@firstName", obj.FirstName);
      cmd.Parameters.AddWithValue("@lastName", obj.LastName);
      cmd.Parameters.AddWithValue("@telephone", obj.Telephone);
      cmd.Parameters.AddWithValue("@address", obj.Address);
      cmd.Parameters.AddWithValue("@city", obj.City);
      cmd.Parameters.AddWithValue("@state", obj.State);
      cmd.Parameters.AddWithValue("@zip", obj.Zip);
      cmd.Parameters.AddWithValue("@web", obj.Web);
      cmd.ExecuteNonQuery();
    }

  }catch (Exception ex){}
}

I have couple of questions for the above code

1. Do I have to close connection manually?
2. Do I need to dispose Command object?
3. If exception occurs, do I have to close connection and command
4. How do I enhance this code further?