I try convert date from my csv file, but catch error : Can not convert null to 'System.DateTime' type.

Sample to reproduce error :

```

$some_string = "(PDH-CSV 4.0) (E. South America Daylight Time)(120),\\NA\Process(w3wp_10060)\% Processor Time,\\NA\Process(w3wp_10060)\% User Time,\\NA\Process(w3wp_10060)\% Privileged Time,\\NA\Process(w3wp_10060)\Page Faults/sec,\\NA\Process(w3wp_10060)\Working Set,\\NA\Process(w3wp_10060)\Private Bytes,\\NA\Process(w3wp_10060)\Thread Count,\\NA\Process(w3wp_10060)\Handle Count`n" +
"10/29/2014 09:37:41.056, , , , ,55205888,44847104,26,471`n" +
"10/29/2014 09:37:46.931,0,0,0,0.17039241953890988,55209984,44847104,26,471`n" +
"10/29/2014 09:37:52.806,0,0,0,0,55209984,44847104,26,471`n"

$datasource = $some_string | ConvertFrom-Csv -Delim ','

foreach ($datapoint in $datasource) 
{
    $date = [DateTime]$datapoint.$StrData
    Write-Host $date
}

```

[EDIT]

This way worked:

```
$date = [DateTime]$datapoint.'(PDH-CSV 4.0) (E. South America Daylight Time)(120)'

```

Any suggestion ?