PowerShell - attach / deduce / end attachment commands

Question

I am trying to write a piece of code to delete and recreate an MS SQL database in PowerShell using some Invoke-Sqlcmd commands (caused by an error on our systems). I would like to create some unforeseen circumstances in this case if another program on the target machine accesses the database when the drop command is issued. I thought that a good way to do this is to embed one Try / Catch / Finally command inside another, for example:

$strDbName= database
$strUsername= user
$strPassword= pass
$strmdfFilePath= "C:\foo.mdf"
$strldfFilePath= "C:\bar.ldf"

Try
    {
    Write-Host "INFO: Attempting Database DROP command..."
    Invoke-SqlCmd -Username "$strUserName" -Password "$strPassword" -Query "DROP database [$strDbName];"
    }
Catch
    {
    Try
        {
        Invoke-SqlCmd -Username "$strUserName" -Password "$strPassword" -Query "ALTER database [$strDbName] set offline with ROLLBACK IMMEDIATE;"
        Invoke-SqlCmd -Username "$strUserName" -Password "$strPassword" -Query "DROP database [$strDbName];"
    }
    Catch
        {
        Write-Host "Error message"
        }
    Finally
        {
        Exit
        }
    }
Finally
    {
    Invoke-SqlCmd -Username "$strUserName" -Password "$strPassword" -Query "CREATE DATABASE [$strDbName] ON (FILENAME = '$dirMdfFilePath'),(FILENAME = '$dirLdfFilePath') for ATTACH;"
    }

Two questions - A) Do the nesting teams Try / Catch / Finally actually work? and C) Is this type of command sequence a good practice? I do not have a test machine to try this, and if there was an easier way to execute such a command, I would rather know.

Answer 1

A) try/catch . ( Windows):

Write-Host "0"
Try
{
    Write-Host "1"
    throw
}
Catch
{
    Try
    {
        Write-Host "2"
        throw
    }
    Catch
    {
        Write-Host "3"
    }
    Finally
    {
        Write-Host "4"
        Exit
    }
}
Finally
{
    Write-Host "5"
}

B) . ( catch/finally) , . , , , .

... SO question.