C#更新SQLServer中TimeStamp字段(时间戳)的方法

public partial class Form1 : Form{    private SqlConnection mCnn = null;    private long TimeStampValue;    public Form1()    {      InitializeComponent();      mCnn = new SqlConnection();      mCnn.ConnectionString = "Data Source=192.168.18.205;Database=" +              "Test;Uid=sa;Pwd=kicpassword";      mCnn.Open();    }    //读取    private void btnReadTimeStamp_Click(object sender, EventArgs e)    {      //使用convert(bigint,FTimeStamp) MyTimeStamp把FTimeStamp转换为bigint整数类型      string strSQL = "Select Top 1 FCaption,convert(bigint,FTimeStamp) MyTimeStamp,FTimeStamp From t_TimeStamp";      SqlCommand Cmd = new SqlCommand(strSQL, mCnn);      SqlDataReader Reader = Cmd.ExecuteReader();      while (Reader.Read())      {        long value = (long)Reader["MyTimeStamp"];        TimeStampValue = value;        //在此处把TimeStamp的值赋值给变量，用于更新时判断        txtTimeStamp.Text = value.ToString();        txtTimeStampHex.Text=value.ToString("X16");      }      Reader.Close();      Reader = null;    }    //更新    private void btnUpdateTimeStamp_Click(object sender, EventArgs e)    {      //Where条件加上TimeStamp的判断,必须和读取的一致,用于并发操作      string strSQL = "Update t_TimeStamp Set FCaption = '修改记录'" +        " Where FTimeStamp =" + TimeStampValue.ToString();      SqlCommand cmd = new SqlCommand(strSQL, mCnn);      int UpdateCount = cmd.ExecuteNonQuery();      if (UpdateCount <= 0)      {        MessageBox.Show("更新失败!");      }      else      {        MessageBox.Show("更新成功!");                        }    }}