【解決方法】ウィンドウアプリケーションを使用してcsvファイルの日時値をSQLサーバーにインポート中にエラーが発生しました

error:System.InvalidCastException: ‘指定されたキャストは無効です。’

csv データ:
datetime ミリ秒 MachineAutoStartStop 圧力
2022/10/25 0:00 655 1 0.382796
2022/10/25 0:00 899 1 0.382796
25/10/2022 10:31 37 1 0.382796
2022/10/25 10:31 38 1 0.382796
25/10/2022 10:31 787 1 0.382796

エラー行: cmd.Parameters.AddWithValue(“@DateTime”, (DateTime)importRow[“DateTime”]);

私が試したこと：

private void btnbrowse_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.DefaultExt = ".csv";
            ofd.Filter = "Comma Separated (*.csv)|*.csv";
            ofd.ShowDialog();
            txtfilename.Text = ofd.FileName;

            DataTable dt = new DataTable();
            dataGridView1.DataSource = dt.DefaultView;
            {
              
             }
            }
        private void btnclose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void btnimport_Click(object sender, EventArgs e)
        {
            Cursor = Cursors.WaitCursor;

            DataTable dt = GetDataFromFile();

            if (dt == null) return;

            SaveImportDataToDatabase(dt);

            MessageBox.Show("Data Import success!");
            txtfilename.Text = string.Empty;
            Cursor = Cursors.Default;

        }
        private DataTable GetDataFromFile()
        {
            DataTable dt = new DataTable();

            try
            {
                using (StreamReader sr = new StreamReader(txtfilename.Text))
                {
                    string header = sr.ReadLine();
                    if (string.IsNullOrEmpty(header))
                    {
                        MessageBox.Show("no file data");
                        return null;
                    }
                    string[] headerColumns = header.Split(',');
                    foreach (string headerColumn in headerColumns)
                    {
                        dt.Columns.Add(headerColumn);
                    }

                    while (!sr.EndOfStream)
                    {
                        string line = sr.ReadLine();
                        if (string.IsNullOrEmpty(line)) continue;
                        string[] fields = line.Split(',');
                        DataRow importedRow = dt.NewRow();

                        for (int i = 0; i < fields.Count(); i++)
                        {
                            importedRow[i] = fields[i];
                        }
                        dt.Rows.Add(importedRow);
                        
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("the file could not be read:");
                Console.WriteLine(e.Message);
            }

            return dt;
        }
        private void SaveImportDataToDatabase(DataTable S2P5)
{
using (SqlConnection conn =New SqlConnection(@"Data Source=BL03\SQLEXPRESS; Initial Catalog=HDB; User Id=sa; Password=00"))
{
    conn.Open();

    foreach (DataRow importRow in S2P5.Rows)
    {
        SqlCommand cmd = new SqlCommand ("INSERT INTO S2P5 (DateTime, Miliseconds, MachineAutoStartStop, Pressure)" + 
                                         "VALUES (@DateTime, @Miliseconds, @MachineAutoStartStop, @Pressure)", conn);
      
        cmd.Parameters.AddWithValue("@DateTime", (DateTime)importRow["DateTime"]);
        cmd.Parameters.AddWithValue("@Miliseconds", importRow["Miliseconds"]);
        cmd.Parameters.AddWithValue("@MachineAutoStartStop", importRow["MachineAutoStartStop"]);
        cmd.Parameters.AddWithValue("@Pressure", importRow["Pressure"]);

        cmd.ExecuteNonQuery();
    }
}