SqlDependency搞乱了应用程序属性

Question

In C# windows forms application in main Form constructor I have the following code (updated to the actual code from the app):

SqlDependency.Stop(Properties.Settings.Default.EmployeeHealthDB, Properties.Settings.Default.NotificationQueueName);
        IsUsingSqlDependency = SqlDependency.Start(Properties.Settings.Default.EmployeeHealthDB, Properties.Settings.Default.NotificationQueueName);

SQL dependency works intermittently and quite often I am getting following error on the second statement:

Properties.Settings.Default.ConnStr 'System.Windows.Forms.PropertyStore' does not contain a definition for 'Settings' and no extension method 'Settings' accepting a first argument of type 'System.Windows.Forms.PropertyStore' could be found (are you missing a using directive or an assembly reference?)

As you can see the first statement refers to exactly the same settings values and it doesn't fail.

On occasions when this part works the application is able to catch database changes and do what I want it to do, but it may give an error on application exit (on Form Closing event) where I use the same exactly statement (as first one) to stop dependency as above. The debugger doesn't provide any useful information, no stack information available. The error can be either SqlException or the same as above.

I just ran my application 6 times (in debugger) - without changing anything and without doing anything within the application - just open main form and close main form. First two times I got the error on SqlSDependency.Start, then next 4 times it ran just fine.

Using VS 2013 Professional, .NET 4.5, C#. Building on Win 7 x64 but generated code is for x32 bit systems.

I thought that using dependency was a great idea because users wanted to see changes made by other users without manually refreshing data but I am struggling.

Answer 1

Adding application namespace as in the linked article provided by mjwills resolved my issue.

Properties does not exist in the current context