Filter data table in Powershell

Hi All,

I have one script, where i have one datatable, from that datatable i want to get data based on one search filter. 

#Get the excel as csv and load in datatable...
$empTable = New-Object System.Data.DataTable;
$empTable = Import-Csv -Path "~\Employee.csv";

#Get only Month column from the data table...
$empMonthTable = New-Object System.Data.DataTable;
$empMonthTable = $empTable | Select-Object -Property "Month";

#Sort the data table...
$sortMonth = New-Object System.Data.DataTable;
$sortMonth = $empMonthTable | Sort-Object -Property Month;

#Get Unique data from data table...
$unqiueMonth = New-Object System.Data.DataTable;
$uniqueMonth = $sortMonth | Select-Object -Unique Month;

#Get data from datatable with unique month...

foreach ($monthData in $uniqueMonth)
{	

[string] $month = $monthData | Out-String;	
$month;	
$eachMonthData = $empTable | Where-Object {$_.Month -eq $month};		
$eachMonthData;
}

Here in output of "$eachMonthData" is returning null table. But if there am putting hardcoded value like "Mar", then table is returning values.

Could you please suggest me how to achieve this?