Okay below image is explaining everything.
i have also included the code for further explanation.
Thread.CurrentThread.CurrentCulture = New CultureInfo(Session("Lang").ToString())
Dim rm As ResourceManager = New ResourceManager("TodayTimesheet.App_GlobalResources.Lang", Assembly.GetExecutingAssembly())
Dim ci As CultureInfo = Thread.CurrentThread.CurrentCulture
btnSubmit.Text = rm.GetString("Add", ci)
Error message:
An exception of type 'System.Resources.MissingManifestResourceException' occurred in mscorlib.dll but was not handled in user code
Additional information: Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "TodayTimesheet.App_GlobalResources.Lang.resources" was correctly embedded or linked into assembly "TodayTimesheet" at compile time, or that all the satellite assemblies required are loadable and fully signed.