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حالا از این خط خطا میگیره
objDataAdapter.Fill(objDataSet, "db1");

میگه:
The SelectCommand property has not been initialized before calling 'Fill'.
اینم کد کامل
using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;



namespace WindowsApplication3

{

    public partial class Form1 : Form

    {

  

        private const string _Commandtext = "SELECT ID,FirstName,LastName,Address,TelNumber FROM db1";

        private const string _ConnectionString = "Server=localhost;Database=db1;User ID=Admin;Password=;";

        SqlConnection objConnection;

        SqlDataAdapter objDataAdapter;

        DataSet objDataSet;

        DataView objDataView;

        CurrencyManager objCurrencyManager;

        private void FillDataSetAndView()

        {

            objDataAdapter = new SqlDataAdapter();

            objDataSet = new DataSet();

            objDataAdapter.Fill(objDataSet, "db1");

            objDataView = new DataView(objDataSet.Tables["db1"]);

            objCurrencyManager = (CurrencyManager)(this.BindingContext[objDataView]);



        }

        private void BindFields()

        {

            iDTextBox.DataBindings.Clear();

            firstNameTextBox.DataBindings.Clear();

            lastNameTextBox.DataBindings.Clear();

            addressTextBox.DataBindings.Clear();

            telNumberTextBox.DataBindings.Clear();



            iDTextBox.DataBindings.Add("Text", objDataSet, "db1.ID");

            firstNameTextBox.DataBindings.Add("Text", objDataSet, "db1.FirstName");

            lastNameTextBox.DataBindings.Add("Text", objDataSet, "db1.LastName");

            addressTextBox.DataBindings.Add("Text", objDataSet, "db1.Address");

            telNumberTextBox.DataBindings.Add("Text", objDataSet, "db1.TelNumbre");

            statusStrip1.Text = "Ready";





        }

        public Form1()

        {

            InitializeComponent();

            objConnection = new SqlConnection(_ConnectionString);

            objDataAdapter = new SqlDataAdapter(_Commandtext, objConnection);

        }





        private void Form1_Load(object sender, EventArgs e)

        {

            // TODO: This line of code loads data into the 'db1DataSet.Moshtarakin' table. You can move, or remove it, as needed.

            this.moshtarakinTableAdapter.Fill(this.db1DataSet.  Moshtarakin);

            FillDataSetAndView();

            BindFields();



        }

    }

}