April 24, 2024

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Add List Item in SharePoint Online using ASP.net and C#

In this article, I will describe how you can send data from an ASP.net (web form) application to SharePoint Online custom list.

The scenario of this request, was that a client wanted to have an internet facing (without opening its SharePoint to the public) public form. So I suggested using Windows Azure to deploy a .Net Application (ASP.net and C#) which people can access (anonymously), submit the data, and get the data sent across to a Sharepoint List.

Here are the simple steps to follow:

1- Create you form with ASP.net

I used BootStrap Framework along side to ASP.net, HTML and CSS3.

2- Download ‘SharePoint Online Client Components SDK’

Download Link

3- Include the required references

You need to reference the following:


4- The Magic !!

Assuming that you do you proper data validation and fancy animations 🙂 (Optional), you need to run the following code in you submit event (or button).

#region Connexion to SharePoint
string WebUrl = "https://You.sharepoint.com/sites/ABC/";
string login = "**********";
string password = "**********";
var securePassword = new SecureString();
foreach (char c in password)
var onlineCredentials = new SharePointOnlineCredentials(login, securePassword);

#region Insert the data
using (ClientContext CContext = new ClientContext(WebUrl))
CContext.Credentials = onlineCredentials;
List announcementsList = CContext.Web.Lists.GetByTitle("Supply GateWay");
ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();
Microsoft.SharePoint.Client.ListItem newItem = announcementsList.AddItem(itemCreateInfo);
newItem["Title"] = C_Name.Value;
newItem["Address"] = C_Address.Value;