How to Read a SharePoint List Using .NET 8?

Question

System.Net.WebException: 'The remote server returned an error: (403) FORBIDDEN.'
I am using .NET 8, and I've already tried with GetACSAppOnlyContext but it wouldn't work because I need to access more than 5 SharePoint sites simultaneously. There was an error in CC.ExecuteQuery();

    using (CC = authManager.GetWebLoginClientContext(siteUrl))
    {
        List list = CC.Web.Lists.GetByTitle("TT_002_Test");
        CamlQuery oQuery = CamlQuery.CreateAllItemsQuery();
        ListItemCollection oCollection = list.GetItems(oQuery);
        CC.Load(oCollection);
        CC.ExecuteQuery();
	}  

Answer 1

Whether the account enabled MFA?

Make sure the account has permission for 5 sites then run following codes. Replace username, password, and domain with the appropriate values.

using (ClientContext context = new ClientContext(siteUrl)) 
{ 
    string userName = "username"; 
    string password = "password"; 
    string domain = "domain"; 
    context.Credentials = new NetworkCredential(userName, password, domain); 
    List list = context.Web.Lists.GetByTitle("TT_002_Test"); 
    CamlQuery oQuery = CamlQuery.CreateAllItemsQuery(); 
    ListItemCollection oCollection = list.GetItems(oQuery); 
    context.Load(oCollection); context.ExecuteQuery(); 
}

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Answer 2

it sounds like your sharepoint site is using oauth, and you are trying to use an application id (clientid/secret). in sharepoint the appid are part of the site, so you will have a unique clients/secret per site. you need a unique connection for each site anyway, so each url will have its login.