OrchestrationFunction.cs

[FunctionName("OrchestrationFunction")]
public static async Task<string> OrchestrationStart(
[OrchestrationTrigger] IDurableOrchestrationContext context, ILogger logger)
{
    var result = "";
    var input = context.GetInput<string>();
    try
    {
        result = await context.CallActivityAsync<string>("CreateMessage", input);
        await context.CallActivityAsync("SendMessageToQueue", result);
    }
    catch (Exception ex)
    {
        logger.LogError("Something went wrong", ex);
        return string.Empty;
    }

    return result;
}