Short and simple...  When I pass User.Identity.Name from a VB code behind aspx page to a C# custom provider the value changes from <domain>\<userName> to <domain>\\<userName>.  Note the double \\.  Why is this and how do I handle it? 

I tried using a replace function but when I type a single \ in the string to use as the substitution, C# thinks I want a new line and says 'Newline in constant' error.

I looked at the ProviderToolkitSampleProviders.  Particularly the SQLRoleProvider.GetRolesForUser(string username).  They don't handle any problems with the username so I'm thinking that I'm doing something wrong or they handle it in the base class somehow.  Any ideas?

You don't need to be worry about the '\\', you can't in C# write one single '\'. It's because '\' is an escape sequence and in C# '\\' is handle like '\'.

With further debugging I found the my stored procedure is bailing before the userId lookup when I try to get the applicationId from the applicationName.  Below is the code used to get the applicationName.  If returns the virtual path of '/<application name>'.  Note the inclusion of the forward slash.  This does not equal <applicationName> which is what's in the database.  This code also came from the toolkit in the SecUtil.cs  I can augment my sql in the stored procedure but this seems like a bandaid when the aspnet database doesn't do this.  Any suggestions?

internal static string GetDefaultAppName()

        {

            try

            {

                string appName = HostingEnvironment.ApplicationVirtualPath;

                if (String.IsNullOrEmpty(appName))

                {

                    appName = System.Diagnostics.Process.GetCurrentProcess().

                                     MainModule.ModuleName;

                    int indexOfDot = appName.IndexOf('.');

                    if (indexOfDot != -1)

                    {

                        appName = appName.Remove(indexOfDot);

                    }

                }

                if (String.IsNullOrEmpty(appName))

                {

                    return "/";

                }

                else

                {

                    return appName;

                }

            }

            catch

            {

                return "/";

            }

        }