ET. questions

• how List<T> does not implement Add(object value)?
• How to determine whether a linked list contains a loop? [duplicate]
• Simple DataBinding
• When exactly onServiceConnected for bounded service will be called?
• Incorrect image dimensions in android when using Bitmap
• Validation in WPF - Custom validation rule or IDataErrorInfo
• What interfaces do all arrays implement in C#?

ET. answers