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This is a question about the new way of handling authentication and membership which is based on asp.net Identity
I have just create a web application project with web forms and make some test.
Here I have a piece of code. If I put a breakpoint at this statement userManager.AddToRole
I can see that in database table AspNetUsers I have my name tony there. If I look in table AspNetRoles I have role MyRole there.
So It would be fine to do this statement
userManager.AddToRole("tony", "MyRole");
because I have the name tony in AspNetUsers and I have MyRole in AspNetRoles
But I get exception saying "UserId not found" but name tony really exist in table AspNetUsers why do I get exception ?
protected void Page_Load(object sender, EventArgs e)
{
  ...
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