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Home/.NET framework

WhatisWhatis Latest Questions

Singasani Akshay
  • 1
Singasani Akshay
Asked: February 27, 2022In: Technology, Website Development

How To Fix Object Reference Not Set To An Instance of An Object?

  • 1

How to fix object reference not set to an instance of an object? What does unity nullreferenceexception: object reference not set to an instance of an object mean?

.NET.NET frameworkObjectobject reference not set to an instance of an objectobject reference not set to an instance of an object c# unitysystem.nullreferenceexception: 'object reference not set to an instance of an object.'unity nullreferenceexception: object reference not set to an instance of an object
  1. Best Answer
    Singasani Akshay
    Added an answer on February 27, 2022 at 1:30 pm

    The Object reference not set to an instance of an object is a common error that developers notice on .NET app or frameworks. Though plenty of causes can result in such errors, we’ll discuss here some major reasons for the occurrence of such types of errors.  Usually, the error gets displayed when yoRead more

    The Object reference not set to an instance of an object is a common error that developers notice on .NET app or frameworks. Though plenty of causes can result in such errors, we’ll discuss here some major reasons for the occurrence of such types of errors. 

    Usually, the error gets displayed when you try to obtain an object that hasn’t been instantiated yet. You have to ensure that your system doesn’t encounter runtime errors or else, it can lead to a data breach. During any such instance, remote hackers can manipulate your data and even stall your server. 

    Fixing object reference not set to an instance of an object c# unity (Basics And Introductory Explanation)

    It usually occurs as soon as you get NullReferenceException. When you work on .NET, you have to understand value types and reference types. Value types store the data while reference types don’t hold the data. Under reference types, they hold a specific reference point where object can be stored in memory. 

    Know more:

    • Top 100+ .net Framework Interview Questions and Answers

    For example, a web page link can serve as a reference type while Date/Time serve as value types. A variable can be stored under a reference types. When a reference doesn’t go to a specific object, it’s nullreference. Many of .Net App errors emanate from nullreference. 

    How to fix system.nullreferenceexception: ‘object reference not set to an instance of an object’.

    This code may generate a nullreferenceexception. But its variable ‘text’ has to be null in it. 

    public void MyMethod(string text) 

    { 

      //Throws exception if text == null 

      if (text.ToUpper() == “Hello World”) 

      { 

           //do something 

      } 

    } 

    You may also get null reference exceptions when any type of object is null. If you haven’t initialized SqlCommand object, it may lead to a serious SQL query error. A null string can be serious in SqlCommand, unless you get it fixed at the earliest. 

    SqlCommand command = null; 

    //Exception! Object reference not set to an instance of an object 

    command.ExecuteNonQuery();

    How to Utilise Null Coalescing to Avoid NullReferenceExceptions?

    You can use the null coalescing feature—?? operator. It comes with a default value for a previously null-valued variable. 

    You can utilize null coalescing using this code: 

    List<string> values = null; 

    foreach (var value in values ?? new List<string>()) 

    { 

        Console.WriteLine(value); 

    } 

    The errors may originate due to settings, API-type values or database calls. 

    Top 3 tips to prevent system.nullreferenceexception: object reference not set to an instance of an object 

    • Assign particular values to each variable.
    • If the variable is null, process such codes accordingly.
    • Use [?] operator wherever possible

    In Conclusion:

    The object reference not set to an instance of an object is one of the commonest errors within .NET framework or app. You can use if-conditional statement to understand whether your variable has a specific reference. Such problems occur frequently under .NET framework. 

    All reference types within C# come with a null value. However, some data types like int and Boolean don’t have null values if you don’t define them appropriately. You must check all variables before assigning codes to them. You can also ensure that you check if-else statement for null values. 

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  • 1 Answer
  • 51 Views
Singasani Akshay
  • 0
Singasani Akshay
Asked: January 23, 2022In: Technology, Website Development

What Is BCL?

  • 0

What Is BCL (Base Class Library)? Explain its essential points in relation to .NET framework and How does it work?

.NET.NET frameworkBase Class LibraryBCLBCL DefinitionDefinitionWhat is BCL
  1. Best Answer
    Singasani Akshay
    Added an answer on January 23, 2022 at 5:51 am

    What is BCL? Base Class Library or BCL refers to a subset available within Framework Class Library (FCL). The term class library refers to a collection of reusable items, which are integrated into CLR.  BCL is important as it helps in simplifying classification of items, which are essential for dailRead more

    What is BCL?

    Base Class Library or BCL refers to a subset available within Framework Class Library (FCL). The term class library refers to a collection of reusable items, which are integrated into CLR. 

    BCL is important as it helps in simplifying classification of items, which are essential for daily operation. For example, when the system has to work with string and primitive type data, BCL steps in to simplify such a task.   

    The appropriate use of BCL is crucial to building software on the .NET framework. BCL facilitates hassle free interaction with the directory and file system on your PC and also communicates with relational databases through ADO.NET. 

    Significance of BCL

    BCL works in tandem with the .NET framework and is compatible for use on .NET 3.5 and Net Standard 2.0. Thus it can work with several types of computer programming languages and operating systems as well. BCL works on Linux and Windows OS too. 

    How does BCL work?

    BCL mainly works in sync with XPRB and XPRBprob classes. You can get these classes in xprbdn assembly. BCL is usually packed into the NuGet folder or nugget lib of the Xpress directory. Add it to a local directory folder for more benefits. 

    In Conclusion:

    BCL works quite differently than other classes. In case of any error, it doesn’t print an error message and nor does it end the program. Usually, it sends the error back to the user-defined sources so that users can check the error correctly. 

    In a nutshell, BCL or Base Class Library has the basic and fundamental types of systems like Date, Time, String, System, and others. For most apps, BCL works well offering consistent speed and accuracy.

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  • 1 Answer
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Singasani Akshay
  • 1
Singasani Akshay
Asked: January 16, 2022In: Technology, Website Development

What is CLR?

  • 1

What is CLR? What are the necessary features, advantages, and disadvantages of CLR (Common Language Runtime) in the .NET framework?

.NET frameworkCILCLRCLR AdvantagesCLR DefinitionCLR DisadvantagesCommon Language RuntimeDefinitionFeatures of CLRWhat is CLR
  1. Best Answer
    Singasani Akshay
    Added an answer on January 16, 2022 at 3:28 pm

    What is CLR? CLR is the short form Common Language Runtime (CLR). It is a .NET framework of Microsoft that enables working of programs bearing various supported languages. CLR is a component of Microsoft’s .NET framework. But it won’t allow a programmer to create a new language. Instead, CLR assistsRead more

    What is CLR?

    CLR is the short form Common Language Runtime (CLR). It is a .NET framework of Microsoft that enables working of programs bearing various supported languages.

    CLR is a component of Microsoft’s .NET framework. But it won’t allow a programmer to create a new language. Instead, CLR assists developers and programmers to integrate different texts or communication media into .NET framework.

    Necessary Points and features of CLR:

    • It converts the source code into a form of bytecode. This bycode has been termed as the Common Intermediate Language (CIL).
    •  It manages the conversion or execution of the CIL code at the run time.
    • The programmers use such languages as C# or VB.Net. These are codes written in a supported .NET programming language.  They are subsequently changed into CIL code.

    Pros of CLR:

    • It enables or permits easy use of different supported languages to reach the target or common goal.
    • Programmers find it versatile and flexible to select their own programming language. But it must be supported by the .NET framework.
    • NET finds CLR handy as the management and execution of all supported languages can be done. This can be done by changing or transforming the languages first to bytecode and then into the native code for the chosen platform. 

    Cons of CLR:

    • CLR can be used only on .NET supported framework.
    • CLR may not be suitable for dynamically typed languages.
    • Transfer or migration of applications to other formats from .Net will be difficult.

    Know more:

    • Top 100+ .net framework Interview Questions and Answers

    Conclusion:

    In short, the function of CLR is to change the CIL code in a language that can be easily realized or comprehended by the operating system in which the programmers are working in the run time. It offers an option for programmers set on working on new language implementations.

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Singasani Akshay
  • 0
Singasani Akshay
Asked: January 16, 2022In: Technology, Website Development

What Is CLS in .NET?

  • 0

What is CLS in .NET? Explain the meaning and significance, pros and cons of the CLS (Common Language Specification) in the .NET Framework?

.NET.NET frameworkCLSCLS DefinitionCommon Language SpecificationCons of CLSDefinitionFeatures of CLSPros of CLSwhat does CLS stand forWhat is CLSWhat is CLS in .NET
  1. Best Answer
    Singasani Akshay
    Added an answer on January 16, 2022 at 9:34 am

    What Does CLS Stand For? CLS is the short form or abbreviation for the Common Language Specification. It is a fundamental class or set of language features that the Common Language Runtime (CLR) of the .NET Framework supports. Learn more: Top 100+ .NET Framework Interview Questions and Answers CLS fRead more

    What Does CLS Stand For?

    CLS is the short form or abbreviation for the Common Language Specification. It is a fundamental class or set of language features that the Common Language Runtime (CLR) of the .NET Framework supports.

    Learn more:

    • Top 100+ .NET Framework Interview Questions and Answers

    CLS functions as a guide or monitor for library and compiler writers.

    CLS is basically a component or part of the specifications of the .NET Framework created to help and support language constructs mostly applied by programmers to create codes that can be verified. Such an act facilitates all CLS-class compliant languages to guarantee the type safety of code.

    Features of CLS:

    • It has features common to many object-oriented programming languages.
    • It is a subset of the operation of the Common Type System.

    Pros of CLS:

    CLS has several benefits. The main benefits are listed below:

    • It permits flexibility in using non-compliant types in the internal implementation of components with CLS-compliant requirements.
    • It functions as an active tool for integrating different languages into one unit that does not have frills.  
    • For libraries CLS is very useful as it permits the libraries to be fully usable in an integrated manner from any language supporting the CLS.

    Cons of CLS

    CLS has certain disadvantages as well as given below:

    • As a particular language specification may not be understood by other programming languages, the CLS sometimes creates some problems. This is primarily due to the reason that the .NET Framework uses many languages like C#, VB.NET and J#. Since these languages follow their own syntactical rules for writing the code, the CLS may not sometimes understand it.  
    • Sometimes, CLS poses some problems to the programmer as CLS sets guidelines that must be supported by all languages that target CLR. The problems may crop up if the programme is not complying with such set guidelines of the CLS.

    In Conclusion:

    CLS determines or guides the basic laws that must be followed for any language targeting common language infrastructure to include with other CLS-compliant languages.

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Singasani Akshay
  • 0
Singasani Akshay
Asked: December 28, 2021In: Technology, Website Development

What is MEF?

  • 0

Explain MEF. How does it benefit Programmers and app developers? Where can you find MEF? What is its composition? Define Imports and Exports in MEF.

.NET frameworkBenefits of MEFDefinitionFrameworkLocation of MEFManaged Extensibility FrameworkMEFMEF CompositionMEF DefinitionWhat is MEF
  1. Best Answer
    Singasani Akshay
    Added an answer on December 28, 2021 at 7:11 am

    MEF Meaning: MEF or the Managed Extensibility Framework refers to a digital library for the formation of extensible technical applications. Using it, software developers and programmers can utilize the available extensions without any coding or configuration. You can even use MEF across applicationsRead more

    MEF Meaning:

    MEF or the Managed Extensibility Framework refers to a digital library for the formation of extensible technical applications. Using it, software developers and programmers can utilize the available extensions without any coding or configuration. You can even use MEF across applications during their development stage. You can reuse it for multiple times.

    Benefits of MEF:

    • MEF helps in arranging smaller components 
    • An MEF component can be easily categorized as imports (dependencies) or exports (capabilities).
    • MEF helps an app function without any codes or config files.
    • You can analyze all parts using metadata.

    Location of MEF

    MEF is a constituent part of the .NET framework. Everytime you use .NET, you have to use MEF as well. MEF works in sync with .NET client as well as ASP.NET and in other technology as well. 

    MEF Composition

    MEF composition basically includes a composition container having all available parts assembled together. It is responsible for performing various computing operations. A part represents any object through which any value can be exported or imported.   

    Imports and Exports of MEF:

    Imports and exports are just a behavioral pattern of how MEF parts operate within the .NET framework. When the component delineates the necessity of assigning a value to a particular object, it is called Imports. While export determines whether the same is available or not. Each import has to be matched with their corresponding export in the MEF.

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