System.Data.SqlClient.SqlException: Incorrect syntax near '='.

 protected void btnLocate_Click(object sender, EventArgs e)
        {
            SqlConnection conDatabase = null;
            try
            {
                 conDatabase = new SqlConnection("server=.;Initial Catalog=harika;Integrated Security=True");
                conDatabase.Open();
                SqlCommand command = new SqlCommand("SELECT * FROM dbo.cars" +
                    "WHERE TagNumber = @TagNbr;", conDatabase);
                command.Parameters.Add("@TagNbr", SqlDbType.VarChar);
                command.Parameters["@TagNbr"].Value = txttag.Text;

                DataSet dsCars = new DataSet("CarsSet");
                SqlDataAdapter sdaCars = new SqlDataAdapter();
               sdaCars.SelectCommand = command;
                //command.CommandText = sdaCars.SelectCommand;

                sdaCars.Fill(dsCars);

                try
                {
                    DataRow recCar = dsCars.Tables[0].Rows[0];
                    if (recCar.IsNull("CarID"))
                        throw new IndexOutOfRangeException("Invalid Tag Number");
                    txtmake.Text = (string)recCar["Make"];
                    txtmodel.Text = (string)recCar["Model"];
                    txtyear.Text = (string)recCar["CarYear"];
                    chkk7.Checked = (bool)recCar["HasK7Player"];
                    chkcd.Checked = (bool)recCar["HasCDPlayer"];
                    chkdvd.Checked = (bool)recCar["HasDVDPlayer"];
                    chkavail.Checked = (bool)recCar["Available"];
                }
                catch (IndexOutOfRangeException)
                {
                    txttag.Text = "";
                    txtmake.Text = "";
                    txtmodel.Text = "";
                    txtyear.Text = "";
                    chkk7.Checked = false;
                    chkcd.Checked = false;
                    chkdvd.Checked = false;
                    chkavail.Checked = false;
                }
            }
            finally
            {
                conDatabase.Close();
            }
        }
        public SqlCommand Command { get; set; }
    }
}