# Register the HNetCfg library (once)
regsvr32 /s hnetcfg.dll

# Create a NetSharingManager object
$m = New-Object -ComObject HNetCfg.HNetShare

# Find connection
$conn_1 = $m.EnumEveryConnection |? { $m.NetConnectionProps.Invoke($_).Name -eq "Ethernet" }
$conn_2 = $m.EnumEveryConnection |? { $m.NetConnectionProps.Invoke($_).Name -eq "VirtualBox Host-Only Network" }

# Get sharing configuration
$config_1 = $m.INetSharingConfigurationForINetConnection.Invoke($conn_1)
$config_2 = $m.INetSharingConfigurationForINetConnection.Invoke($conn_2)

# Disable sharing
Write-Host "Disable Sharing"
$config_1.DisableSharing()
$config_2.DisableSharing()

# Enable sharing
Write-Host "Enable Sharing"
$config_1.EnableSharing(0)
$config_2.EnableSharing(1)