The type or namespace SharePointOnlineCredentials could not be found error in console application for SharePoint online

This SharePoint csom tutorial, we will discuss how to fix an error The type or namespace SharePointOnlineCredentials could not be found which comes when we create a console application for SharePoint online Office 365 sites (sharepointonlinecredentials not found).

Recently I have created a console application for SharePoint online but when I am using the below code to pass the credentials to connect to SharePoint online site it gave the below error.

clientContext.AuthenticationMode = ClientAuthenticationMode.Default;
clientContext.Credentials = new SharePointOnlineCredentials(GetSPOAccountName(), GetSPOSecureStringPassword());

The error comes as:
The type or namespace SharePointOnlineCredentials could not be found (are you missing a using directive or an assembly reference?). It looks like below:

In that console application, I have added the Microsoft.SharePoint.Client.dll (version: v14.0.4762.1000) from the NuGet package.

To resolve the issue, I have added the “Microsoft.Sharepoint.Client.Online.CSOM” from NuGet itself. You can find like below:

After this, the error (sharepointonlinecredentials not found) will not come.

You may like following SharePoint csom tutorials:

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• Delete sites and subsites programmatically using CSOM in SharePoint Online

This SharePoint tutorial helps us to solve error The type or namespace SharePointOnlineCredentials could not be found.