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If you are referring an old DLL then it can't be used. So you have to refer to a new DLL. If you are using it in a different namespace and trying to use the other namespace's dll then it won't refer to this method. You may need to rebuild the project. I think third option might be the cause for you.
12 Φεβ 2023 · This article explains the various behaviors of inheritance in OOP in various cases. Inheritance is creating classes that inherit certain aspects from parent classes. If you are not familiar with object-oriented programming, please read A Complete Guide To Object Oriented Programming In C#. Objective.
22 Απρ 2023 · In this tutorial, you'll build a console application and see the basic object-oriented features that are part of the C# language.
Exercises. We have gathered a variety of C# exercises (with answers) for each C# Chapter. Try to solve an exercise by editing some code, or show the answer to see what you've done wrong.
1 Φεβ 2023 · #if, along with the #else, #elif, #endif, #define, and #undef directives, lets you include or exclude code based on the existence of one or more symbols. Conditional compilation can be useful when compiling code for a debug build or when compiling for a specific configuration.
It means your code used an object reference variable that was set to null (i.e. it did not reference an actual object instance). To prevent the error, objects that could be null should be tested for null before being used.
Practice object-oriented programming exercises in C#. Learn to use constructors, destructors, inheritance, interfaces among others.
