public async Task deleteSubnetsAsync(string vpcid)
{
var response = await _ec2Client.DescribeSubnetsAsync(new DescribeSubnetsRequest{
Filters = { new Filter("vpc-id", new List<string> { vpcid })}
});
foreach (var subnet in response.Subnets)
{
await _ec2Client.DeleteSubnetAsync(new DeleteSubnetRequest { SubnetId = subnet.SubnetId });
}
}