'variable' is not declared. It may be inaccessible due to its protection level.

I have been trying to get a value from my sql database to post to the form I have.  I have thought i was pretty close but it keeps giving me the error "User_EmailTextBox is not declared.  It may be inaccessible due to its protection level".  I have been trying to get this to work for a week and I can't seem to figure it out.  Any help would be appreciated.  My code is below.
web.config ---------------------------------------------------------------------------- <?xml version="1.0"?> <configuration> <connectionStrings> <add name="ECDRConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Program Files (x86)\Microsoft SQL Server\MSSQL.1\MSSQL\Data\ECDR.mdf";Integrated Security=True;Connect Timeout=30;User Instance=True" providerName="System.Data.SqlClient" /> ...