SharePointOnlineCredentials Missing or not found

Question

I have added Sharepoint reference in my project. Even after adding reference, it is showing:

SharePointOnlineCredentials Missing or not found.

Can anyone suggest a solution?

Answer 1

Add this package "Microsoft.Sharepoint.Client.Online.CSOM"

Answer 2

1. Right click on the project Click on Add Reference
2. In the Assemblies, select Extensions Make sure that you have check both, Microsoft.SharePoint.Client and Microsoft.SharePoint.Client.Runtime
3. Add using Microsoft.SharePoint.Client; in your references