what is mean by Trace Class?

Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds. (More...)

Debug class depends on the DEBUG symbol and the Trace class depends on the TRACE Symbol. (More...)

Use Debug class for debug builds, use Trace class for both debug and release builds. (More...)

Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds. (More...)

debug class for debud builld only and trace class for both debug and release builds (More...)

Use Debug class for debug builds, use Trace class for both debug and release builds. (More...)

It looks same. We can use Debug class for debug builds snd Trace class for both debug and release builds.
(More...)

system.object (More...)

The struct type is suitable for representing lightweight objects such as Point, Rectangle, and Color. Although it is possible to represent a point as a class, a struct is more efficient in some scenarios. For example, if you declare an array of 1000 Point objects, you will allocate additional memory for referencing each object. In this case, the struct is less expensive.

When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized.

It is an error to declare a default (parameterless) constructor for a struct. A default constructor is always provided to initialize the struct members to their default values.

It is an error to initialize an instance field in a struct.

There is no inheritance for structs as there is for classes. A struct cannot inherit from another struct or class, and it cannot be the base of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do.

A struct is a value type, while a class is a reference type. (More...)

Its possible If its a static method.

Its possible by inheriting from that class also.

Its possible from derived classes using base keyword. (More...)