ToString() method in .Net

ToString is the major formatting method in the .NET Framework. It converts an object to its string representation so that it is suitable for display.
ToString is should be used when you have a need to change a data type to a string. For built in types like int and such there string representations are what you expect hence we can say that ToString allows you to use the complex formating build into .net with your own objects. you can provide complex formatters like the datetime class does to give flexibility in using your own types.

Take a look at given MSDN Links Object.ToString Method[^]
Convert.ToString Method[^]
for more details

Why Convert class is designed in .NET?

We all know that Convert.ToString(null) will throw a null exception. Why having this method is myObject.ToString() will always return a correct result if myObject was instantiated. Why having the first form at all? :-)

Seriously, ToString is a fundamental method of all objects. It is fundamentally important as it is used inside the .NET libraries internally everywhere a string representation is needed. This method is object-oriented, it is applied on polymorphous containers.

In contrast, the class Convert does not have fundamental importance. It's mainly a collection of utility methods mostly used for convenience of the developers. I notices this class is mostly used by very inexperienced developers. Not all of it, though. Some methods are really important, such as group of the method ChangeType and base64 methods. In general, this is just a collection of primitive methods put together for convenience.

—SA