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I have two different web project (Project-A & Project-B) in a same solution.
Both project having seperate login form to enter into their application.
But In my case, If any of my customer log-in into project-A from there he can able to Login to Project-B (by clicking a button from Project-A) without giving the username and password of Project-B.
1. Customer will have same user name and password for both the project.
2. Project-B using asp:Login form.


Specifying a single authentication key is the solution. For each ASP.NET application, you have to use the same <machinekey> element in the web.config, as follows:

As below :


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