PowerShell Script to count/track the new updated lines from a dynamically updating file

The scenario is like you need to read the recent most file created from a directory, your script need to identify the most recent created file and then read it to get the count of logs generated in last one hour.

############################################################################# 
## 
## Updating Logs Count
## Created by Ataul Haque
## Date : 23 Sep 2016 
## Version : 1.0 
## Email: ataulhaque@outlook.com  
############################################################################## 

$hostname = $env:computername
$dir = "C:\ataul\"
$latest = Get-ChildItem -Path $dir | Sort-Object LastAccessTime -Descending | Select-Object -First 1
$latest.name
$BOCLogFile = "$latest"
( Get-Content $BOCLogFile ) | Where { $_ } | Set-Content $BOCLogFile 
$count = 0
$reader = New-Object IO.StreamReader $BOCLogFile
while($reader.ReadLine() -ne $null){ $count++ }
$reader.Close()
$LastLine = Get-Content $BOCLogFile | Select-Object -last 1
$items = $LastLine -split '\s+'
$LastLogHour = $items[2].split(':')
[int]$intNum = [convert]::ToInt32($LastLogHour[0], 10)
$lastHour = [int]$intNum - 1;
$lastHourLogLine = [string]$lastHour+":"+$LastLogHour[1]+":"+$LastLogHour[2]
echo $lastHourLogLine
$LineNumber = Select-String -Path $BOCLogFile -Pattern $lastHourLogLine | Select-Object -First 1 | Select-Object -ExpandProperty 'LineNumber'
[int]$LinesAdded = [int]$count - [int]$LineNumber
#echo $LinesAdded
[string]$Outputreport = "Logs generated in Last One Hour: $LinesAdded";
echo $Outputreport
#Now send this data in any way you like either using web services or using sendMail option