Access datarow from a workflow - powershell

Question

I have a script which look like below:
function Invoke-SQL {
param(
[string] $dataSource = ".\MSSQLSERVER",
[string] $database = "master",
[string] $sqlCommand = $(throw "Please specify a query.")
)
$connectionString = "Data Source=$dataSource; Integrated Security=True; Initial Catalog=$database; Connect Timeout=100"
$connection = new-object system.data.SqlClient.SQLConnection($connectionString)
$command = new-object system.data.sqlclient.sqlcommand($sqlCommand,$connection)
Try {
$connection.Open()
} catch {
return, $null
}
$adapter = New-Object System.Data.sqlclient.sqlDataAdapter $command
$dataset = New-Object System.Data.DataSet
$adapter.Fill($dataSet) | Out-Null
$connection.Close()
$dataSet.Tables
}
[string]$SQL = "select CmsSrvName from CmsServerList_VM"
$DbInstances = Invoke-SQL "DBSRV" "Test" $SQL
workflow wf1{
Param([System.Data.DataTable]$instance)
ForEach -Parallel -ThrottleLimit 10 ($i in $instance) {
InlineScript{
$t = $using:i
Write-Verbose "$t['CmsSrvName']"
}
}
}
wf1 -Verbose $DbInstances
Output:
VERBOSE: [localhost]:System.Data.DataRow['CmsSrvName']
VERBOSE: [localhost]:System.Data.DataRow['CmsSrvName']
VERBOSE: [localhost]:System.Data.DataRow['CmsSrvName']
The output is not what I expected, it just print out the type name not the value. How can I access the DataRow value in a workflow?(in Powershell 5)
Thanks in advance for the help