CheckAzureCloudServiceNameAvailability.cs

Func<string, Task<bool>> CheckNameAvailabilityAsync = async (cloudServiceName) => 
{
    var computeManagementClient = new Microsoft.WindowsAzure.Management.Compute.ComputeManagementClient( // Microsoft.WindowsAzure.Management.Compute.8.0.0
        new Microsoft.Azure.CertificateCloudCredentials( // Microsoft.Azure.Common.2.0.1
            subscriptionID, subscriptionManagementCertificateThumbprint.FindX509CertificateByThumbprint(storeLocation)));

    var result = await computeManagementClient.HostedServices.CheckNameAvailabilityAsync(cloudServiceName, cancellationToken);
    return result.IsAvailable;
};

Func<string, string> CreateCloudServiceName = (prefix) =>
{
    return string.Join("-", prefix, System.DateTime.UtcNow.ToString("yyMMddhhmmssfff"), Guid.NewGuid().ToString());
};