Task02

WPF have two interfaces supporting validation:

• IDataErrorInfo,
• INotifyDataErrorInfo.

The second one (INotifyDataErrorInfo) is a newer one and have much more features than former solution:

• multiple rules per property,
• cross-property validation,
• async validation.

TimesheetEntryView

Create ValidationObject class which will be implemented INotifyDataErrorInfo interface.

Using DataAnnotations attributes create basic validations for the fields:

• ProjectId - filed is required
• WorkTitle - character length between 2 and 50.

Create Custom Validators:

• TimeSpent - time spent for specific Task (Work Title) can't be longer than 8 hours,
• DateStarted - time spent on Sunday can't be longer than 2 hours.

Validate data before Add/Update timesheet entry (operation can be done only if data are valid).

Create custom ErrorTemplate - the red circle should be visible when validation fails and should be placed on the right side - next to the control (hint: adorner).
ToolTip should present error message.