“延迟”不是Task .NET的成员

Question

我为什么得到

  

“延迟”不是“任务”的成员。

错误？我已经用过

Dim ComPort As String = ""
For Each sp As String In My.Computer.Ports.SerialPortNames
ComPort = sp
Next
If (ComPort <> "") Then
SerialPort1.Close()
SerialPort1.PortName = ComPort
SerialPort1.BaudRate = 9600
SerialPort1.DataBits = 8
SerialPort1.Parity = IO.Ports.Parity.None
SerialPort1.StopBits = IO.Ports.StopBits.One

SerialPort1.Handshake = IO.Ports.Handshake.XOnXOff
SerialPort1.RtsEnable = True
SerialPort1.Encoding = System.Text.Encoding.Default
SerialPort1.ReadTimeout = 10000
SerialPort1.Open()
InComing = SerialPort1.ReadExisting() ' InComing varible storing values as 0000 0000 0000 0012 0023 upto more then 100 times but I just want to get last read value set like 0023.
End If

我有什么想念吗？

The error.