Update Azure VM Size in PowerShell for ARM aka V2

#login to Rm Account

Login-AzureRmAccount

#alternative

#$vmname = "centosweb1hdicp"

#select the subscription id

$subscriptionId =

    (Get-AzureRmSubscription |

     Out-GridView `

        -Title "Select an Azure Subscription ..." `

        -PassThru).SubscriptionId

Select-AzureRmSubscription `

    -SubscriptionId $subscriptionId

#select vm

$centosvm =

    (Get-AzureRmVM |

     Out-GridView `

        -Title "Select an Azure Resource Group ..." `

        -PassThru)

#select the resource group

$rgName = $centosvm.ResourceGroupName

#select the resource group/alternative

#$rgName =

#    (Get-AzureRmResourceGroup |

#     Out-GridView `

#        -Title "Select an Azure Resource Group ..." `

#        -PassThru).ResourceGroupName

#collect VM / alternative

#$centosvm = Get-AzureRmVM | Where-Object {$_.Name -eq "$vmname"}

# current size

$currVMSize=$centosvm.HardwareProfile.VirtualMachineSize

Write-Host "Current Size of the VM: $currVMSize" -BackgroundColor Red -ForegroundColor Cyan

#collect location

$location=(Get-AzureRmResourceGroup -Name $rgName).Location

#collect new size

$newVMSize =

    (Get-AzureRmVMSize -Location $location |

     Out-GridView `

        -Title "Select a VM Size ..." `

        -PassThru).Name

# Stop VM

$centosvm | Stop-AzureRmVm -Force

# Resize VM

$centosvm.HardwareProfile.VirtualMachineSize = $newVMSize

$centosvm | Update-AzureRmVM

# Start VM

$centosvm | Start-AzureRmVm