Capturing an exception in the Azure Worker onStart role method?

I have a problem when my deployment goes through Recycling. From Visual Studio:

"Role instances are reused a certain number of times during the upgrade or upgrade operation. This means that the new version of your service or the configuration settings that you specified when configuring the service do not allow role instances to be run. This means that your code generates raw exception: Please consider fixing your service or changing configuration settings so that role instances do not throw unhandled exceptions, then run another update or operation. th update. As long as you do not start a new upgrade or update operation, Windows Azure will keep trying to upgrade its service to a newer version or configuration you have provided "

My question is: What is the best way to catch an exception? I am a little new to C #. A condensed version of my onStart in case this helps:

public override void Run()
    {
        // This is a sample worker implementation. Replace with your logic.
        Trace.WriteLine("WorkerRole1 entry point called", "Information");

        while (true)
        {
            Thread.Sleep(10000);
            Trace.WriteLine("Working", "Information");
        }
    }

public override bool OnStart()
    {

        // Set the maximum number of concurrent connections 
        ServicePointManager.DefaultConnectionLimit = 12;

        // Retrieve storage account from Connection String
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));

        // Create blob client
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        // retrieve reference to container (blob resides within container)
        CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");

        // create container if it doesn't already exist
        container.CreateIfNotExist();

        // make container public *temp*
        container.SetPermissions(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob });

        // Retrieve references to required blobs
        CloudBlob batch = container.GetBlobReference("batch.bat");

        // Download batch file
        using (var fileStream = System.IO.File.OpenWrite(@"C:\batch.bat"))
        {
            zip.DownloadToStream(fileStream);
        }


        // run batch file

        System.Diagnostics.Process proc = new System.Diagnostics.Process();
        proc.StartInfo.FileName = "C:\\batch.bat";
        proc.StartInfo.RedirectStandardError = false;
        proc.StartInfo.RedirectStandardOutput = false;
        proc.StartInfo.UseShellExecute = false;
        proc.Start();
        proc.WaitForExit();

        return base.OnStart();
    }
}

}

Also in case this helps, here is the stack trace from RDP:

Stack:


at System.IO.__Error.WinIOError(Int32, System.String)
at System.IO.FileStream.Init(System.String, System.IO.FileMode, System.IO.FileAccess, Int32, Boolean, System.IO.FileShare, Int32, System.IO.FileOptions, SECURITY_ATTRIBUTES, System.String, Boolean, Boolean)
at System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare, Int32, System.IO.FileOptions, System.String, Boolean)
at System.IO.FileStream..ctor(System.String, System.IO.FileMode, System.IO.FileAccess, System.IO.FileShare)
at System.IO.File.OpenWrite(System.String)
at WorkerRole1.WorkerRole.OnStart()
at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeRoleInternal(Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleType)
at Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleRuntimeBridge.<InitializeRole>b__0()
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()