Azure Function to Update Table Storage entity - CloudTable.Execute not found

I'm starting out using Azure and c# and I'm attempting to use Table Storage - and using an Azure Function to update entitys in the table. My code is as follows:

 #r "Microsoft.WindowsAzure.Storage"
#r "Newtonsoft.Json"
using System;
using Newtonsoft.Json; 
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Table;

public static async Task<HttpResponseMessage> Run(HttpRequest req, CloudTable lookupTable)
{
    string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
    dynamic data = JsonConvert.DeserializeObject(requestBody);
    string partitionKey = data.Society;
    string rowKey = data.ConnectionDetails.Environment; 
    string newConnection = data.ConnectionDetails.Connection; 

    TableOperation operation = TableOperation.Retrieve<SocietyConnectionDetails>(partitionKey, rowKey); 
    TableResult result = lookupTable.Execute(operation);
    SocietyConnectionDetails societyConnectionDetails = (SocietyConnectionDetails)result.Result; 

    societyConnectionDetails.Connection = newConnection; 
    operation = TableOperation.Replace(societyConnectionDetails); 
    lookupTable.Execute(operation);
}

public class SocietyConnectionDetails : TableEntity
{
    public string Connection {get; set;}
}

But the errors im getting are as follows:

2020-02-25T10:33:16.956 [Error] run.csx(17,38): error CS1061: 'CloudTable' does not contain a definition for 'Execute' and no accessible extension method 'Execute' accepting a first argument of type 'CloudTable' could be found (are you missing a using directive or an assembly reference?)
2020-02-25T10:33:16.984 [Error] run.csx(22,17): error CS1061: 'CloudTable' does not contain a definition for 'Execute' and no accessible extension method 'Execute' accepting a first argument of type 'CloudTable' could be found (are you missing a using directive or an assembly reference?)
2020-02-25T10:33:17.011 [Error] run.csx(8,47): error CS0161: 'Run(HttpRequest, CloudTable)': not all code paths return a value

I can see that the issue is happening when im attempting to 'Execute' my Table Operations... this might be a relatively straight forward problem but I'm struggling to work out why this wouldn't be working...

Thanks for any help..