How do you overcome an object reference not set to an instance of an object?

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Hi,
I am using Datagridview with BackgroundWorker in vb.net to simultaneously check the network connectivity status of list of IP addresses and it’s working properly if the Ping status of all IPs is Success but I am getting an error states Object reference not set to an instance of an object at the 1st IP with Ping status is Timed Out.

Any idea what could be causing it and how I can overcome it?

Your kind support is highly appreciated.

What I have tried:

Below is my full code.

Imports System.ComponentModel
Imports System.Net
Imports System.Net.NetworkInformation
Imports System.Threading

Public Class Form17

Dim Ping As New Ping
Dim i As Integer
Dim reply(i) As PingReply

Private Sub Form17_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'IPSDataDataSet.IPsConnectionStatus' table. You can move, or remove it, as needed.
Me.IPsConnectionStatusTableAdapter.Fill(Me.IPSDataDataSet.IPsConnectionStatus)

BackgroundWorker1.RunWorkerAsync()

End Sub

Private Sub IPsConnectionStatusBindingNavigatorSaveItem_Click(sender As System.Object, e As System.EventArgs) Handles IPsConnectionStatusBindingNavigatorSaveItem.Click
Me.Validate()
Me.IPsConnectionStatusBindingSource.EndEdit()
Me.TableAdapterManager.UpdateAll(Me.IPSDataDataSet)

End Sub

Private Sub BackgroundWorker1_DoWork(sender As System.Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork

Thread.Sleep(1000)

Me.IPsConnectionStatusDataGridView.DataSource = Me.IPsConnectionStatusBindingSource

Try

ReDim reply(IPsConnectionStatusDataGridView.RowCount - 1)
For Me.i = 0 To IPsConnectionStatusDataGridView.RowCount - 1

'==================================

reply(i) = Ping.Send(IPsConnectionStatusDataGridView(1, i).Value, 1000)
IPsConnectionStatusDataGridView(2, i).Value = reply(i).Status.ToString
IPsConnectionStatusDataGridView(3, i).Value = reply(i).RoundtripTime
IPsConnectionStatusDataGridView(6, i).Value = reply(i).Address.ToString() 'Address

Next

Catch ex As Exception

MsgBox(ex.Message)
If ex.InnerException IsNot Nothing Then
MsgBox(ex.InnerException)
End If

End Try
End Sub

Private Sub BackgroundWorker1_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted

Try

BackgroundWorker1.RunWorkerAsync()

'========================================================
If IPsConnectionStatusDataGridView(2, i).Value = "Success" Then
IPsConnectionStatusDataGridView(4, i).Value = Now ' 'Last Succeed On

End If

'================================================================
If IPsConnectionStatusDataGridView(2, i).Value = "TimedOut" Then
IPsConnectionStatusDataGridView(5, i).Value = Now ' 'Last Failed On

End If

Catch ex As Exception

MsgBox(ex.Message)
If ex.InnerException IsNot Nothing Then
MsgBox(ex.InnerException)
End If

End Try
End Sub

End Class

If you are seeing the message "Object reference not set to an instance of an object," reboot your device.

Products affected: SendPro® C Lite, SendPro® C, SendPro®+, SendPro® C Auto (2H00, 8H00, 9H00)

Issue

The message "Object reference not set to an instance of an object" appears when accessing shipping labels.

Cause

Unknown.

Resolution

You may be able to clear the error by restarting the device:

1. Unplug the power cable. The screen should turn off after 10 seconds.
2. Wait 30 seconds.
3. Plug the power cord directly back into a wall outlet. Check that the wall outlet is working correctly.
4. Quickly tap and release the power button to turn the device back on.

If you need further assistance, please contact us.

UPDATED: April 22, 2022

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