Tuesday, 21 August 2012

SharePoint 2010 - asp:CreateUserWizard

While using the asp:CreateUserWizard control to add forms based authentication users to my asp membership database I was encountering the following error:

Exception of type 'System.ArgumentException' was thrown.
Parameter name: encodedValue

The error above was being generated after I successfully created a new user.  The issue it seems is with the control creating a cookie named:  .ASPXAUTH

The solution expire the cookie.

private void ResetAuth()
  HttpCookie aspCookie = new HttpCookie(".ASPXAUTH");
  aspCookie.Expires = DateTime.Now.AddDays(-1);

This needs to be done on both the ContinueButtonClick and the onActiveStepChanged Event.


protected void ActiveStepChanged(object sender, EventArgs e)


protected void btnContinue_Clicked(object sender, EventArgs e)

A more detailed explanation of this and other asp.net login control issues can be found here within Bernado Nguyen-Hoan's Blog

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