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

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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:

The type or namespace SharePointOnlineCredentials could not be found

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

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

The type or namespace SharePointOnlineCredentials could not be found

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

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

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