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Microsoft Excel add-in to write back extended properties to an xlsx

I need a proof of concept to write a "hello world" value back into an extended property in an xlsx file. The code will be part of an estimate template used as a template in an Office365 Sharepoint Library, so it needs to work when using the Office Web-app and desktop version of Excel. My understanding is we will need to use the [login to view URL] api. A simple spreadsheet where I can press a button and the current time/date gets written into an extended property called "load date" will work.

[login to view URL] is a good example of how I want to approach the solution to write extended values.

Skills: Excel, Javascript, C# Programming, .NET

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About the Employer:
( 0 reviews ) Littleton, United States

Project ID: #24110786

41 freelancers are bidding on average $514 for this job

maverick44000

Hello, The desktop and web versions are different. The same Add-in shall not work with both, so you need to address each separately. I can provide the proof of concept for the Desktop version by developing a .Net Addi More

$500 USD in 2 days
(92 Reviews)
7.4
customizedata

There are 3 ways to create Excel add-in [login to view URL] based VSTO (visual studio tools for office), but it will be different for web and desktop versions -->Have created very complex excel add-in that fetched dat More

$600 USD in 7 days
(213 Reviews)
7.3
zekovicm

Hi there I can create that add in for you. Please feel free to initiate the chat so that we can discuss further details. Best regards, Miljan

$452 USD in 5 days
(134 Reviews)
7.3
XeeChaun

hi. I have 6+ years of experience in add-in development for Excel, Outlook, PowerPoint etc. here are couple of my previous projects: ---( https://www.freelancer.com/jobs/project-14212094/ )--- and ---( [login to view URL] More

$750 USD in 10 days
(107 Reviews)
7.0
PSSPL2000

Hi There, We have experience developing multiple office Add-Ins of similar concepts. One of them is in the store as well as Marketplace products. Have a look at them. Link:- [login to view URL] PERSONAL EXPERIE More

$500 USD in 7 days
(21 Reviews)
7.1
dvcontact

Hi, Would you like to see a quick demo of your Microsoft Excel add-in to write back extended properties to an xlsx completed before you award the project? You can consider it professionally done in less than 24 hrs. R More

$500 USD in 3 days
(53 Reviews)
6.4
bdrudra

" SharePoint & .NET Expert " Hello there, Hope you are doing great. We check your requirement and we can do this task. We are a small but excellent team of SharePoint & .NET developers and designers. We have 7+ More

$750 USD in 7 days
(40 Reviews)
6.1
khanicha

Hello, Yes, this is one of ways for developing Office Web Addin. So the js file would your library for extending your Excel Apps features and functions such as adding buttons, task panes, menus, etc. It should be cod More

$400 USD in 2 days
(25 Reviews)
6.3
chirag9700

Hello I have 6+ Year experience in SharePoint. Having Great Experience with Microsoft Office SharePoint Server 2007, Microsoft SharePoint Server 2010, 2013, 2016, On-Premise and SharePoint Online (Office 365) More

$600 USD in 10 days
(3 Reviews)
4.2
azizayoubi

Hello, I am Aziz Ayoubi, MS Excel and Access expert with more than 7 years experience, and 3 years with Google Sheets, .net, Javascript and C# programmer and IT troubleshooting master. I am also a structural engineer More

$251 USD in 3 days
(1 Review)
3.0
Alexsey225

Yes, I can show my sample, I will help you. I'm interesting for your project. Could we discuss more in chatting? Thanks. Anca

$500 USD in 7 days
(2 Reviews)
3.0
maurineted5

I have read the instructions and the question. I am well conversant with the field and I believe I can offer a high quality paper on this assignment delivered on time.

$555 USD in 3 days
(2 Reviews)
2.4
Ruzairabdullah

Hey, i have read your project description and i can do that for you nicely and start work accordingly and will deliver work as the state of satisfaction. Kindly invite me in the chat to discuss about the about the proj More

$500 USD in 2 days
(1 Review)
1.4
SPOThangu

Hi, I experimented in Office 365 Script Lab sometime back and might be interested in this project. I have worked on various apps in SharePoint using Graph API. You can look at the sample here [login to view URL] More

$500 USD in 10 days
(1 Review)
1.0
wisepartner

Hi,dear. I've just checked all requirements of your project 'Microsoft Excel add-in to write back extended properties to an xlsx'. I'm a senior software developer and I'm able to fulfill your project requirements ,you More

$555 USD in 2 days
(1 Review)
0.8
Durga8490

I can do this project if you satisfied with me

$555 USD in 10 days
(0 Reviews)
0.0
$555 USD in 10 days
(0 Reviews)
0.0
$333 USD in 5 days
(0 Reviews)
0.0
$555 USD in 10 days
(0 Reviews)
0.0
hammadraed

I have 15 years of experience with data entry and management and copy-typing. I have strict attention to detail and am a perfectionist. I don't use conversion programs to do work because they are not always perfectly a More

$500 USD in 7 days
(0 Reviews)
0.0