Roman Gruber questions

Roman Gruber answers

• Windows service throws "System.ComponentModel.Win32Exception: Access is denied" when starting
• smtpClient doesn't read the Web.config
• Does ExecuteScalar return immediately after SELECT?
• Unable to cast object of type in System.DirectoryServices.AccountManagement.GroupPrincipal
• Where did Test List go in Visual Studio 2013?
• Error Must declare the scalar variable with Table Valued Parameter
• foreach in a list [C#]
• Change values in Class Attribute at runtime
• What should be the ViewModel members visibility?
• Change button text after click, then change it back after clicking again