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Home/.NET

WhatisWhatis Latest Questions

Singasani Akshay
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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 ASP.NET?

  • 0

What is ASP.NET? What does it stand for or full form? Explain its significance and relevance.

.NETActive Server PageASP.NETASP.NET DefinitionASP.NET Full FormCLRDefinitionweb developer platformWhat is ASP.NET
  1. Best Answer
    Singasani Akshay
    Added an answer on January 23, 2022 at 6:07 am
    This answer was edited.

    What Is ASP.NET? A web developer platform, ASP.NET is a software infrastructure that includes most of the components or facilities needed for it. Different web applications and programmes can be developed with it for PC and mobile devices. The initials ASP stands for Active Server Pages (ASP). ASP.NRead more

    What Is ASP.NET?

    A web developer platform, ASP.NET is a software infrastructure that includes most of the components or facilities needed for it. Different web applications and programmes can be developed with it for PC and mobile devices.

    The initials ASP stands for Active Server Pages (ASP). ASP.NET helps developers to construct dynamic web pages and also facilitates in many other programme developing works including a programming model and software infrastructure. 

    As a programme development system, ASP.NET has several tools, programming languages, and libraries. They help a programmer construct various types of applications. It functions on top of the HTTP protocol and uses the HTTP commands to set a browser-to-server communication.

    Know more:

    • What is HTTP Module in ASP.NET?

    ASP.NET forms an integral component or part of the Microsoft .Net platform and its application codes can be written in any of the four languages which are C#, Visual Basic.Net, Jscript, and J#. It is extensively used to create interactive and data-driven web applications over the internet. 

    The text boxes, buttons, and labels are used under this system to assimilate, assemble, configure and manipulate code to create HTML pages.

    ASP.NET can be used to create several types of computer/mobile apps. It is very useful to create websites or portals. It is easy to use, mostly free, and allows a programmer full control while developing some programmes. 

    It is preferred by the programmers for being an open-source, server-side web-application framework. In 2002, ASP.NET was released by Microsoft with its version 1.0 of the .NET Framework. It has been built on CLR. 

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  • 33 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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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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  • 25 Views
Singasani Akshay
  • 0
Singasani Akshay
Asked: January 16, 2022In: Technology, Website Development

What is Cross Page Posting?

  • 0

What is Cross Page Posting in ASP.NET? What are the features, advantages, and disadvantages of Cross Page Posting?

.NETAdvantages of Cross Page PostingASP.NETCross Page PostingCross Page Posting Definitioncross page posting in asp.netDefinitionDisadvantages of Cross Page PostingFeatures of Cross Page PostingWhat is Cross Page PostingWhat is Cross Page Posting in ASP.NET
  1. Best Answer
    Singasani Akshay
    Added an answer on January 16, 2022 at 8:27 am

    What is Cross Page Posting in ASP.NET? Cross Page Posting refers to posting from data from one page to another page. This method is particularly required when one is creating several pages or multi-page forms to gather different information.  Practically a round-trip cycle, the Cross Page Posting peRead more

    What is Cross Page Posting in ASP.NET?

    Cross Page Posting refers to posting from data from one page to another page. This method is particularly required when one is creating several pages or multi-page forms to gather different information. 

    Practically a round-trip cycle, the Cross Page Posting permits one to post the WebPage and WebPage’s control values to another WebPage thus crossing the posting in the pages. It is used in ASP.Net Web Pages.

    Learn more: Top 100+ .net Interview Questions and Answers

    What are the main features of Cross Page Posting?

    • Data or information is posted back from one page to another. Values of first page controls in the target page. This is helpful for multi-page tasking. 
    • Cross Page Posting allows access to controls of Previous Page using the Previous Page property. Thus it is the safest and smoothest way to transfer one page to another page

    What are the Pros and Cons of Cross Page Posting in ASP.NET?

    Pros of Cross Page Posting in ASP.NET:

    • It is advantageous over using the transfer method to redirect to another page.
    • It is a simple to operate process and system. 
    • It is very useful for social media cross-posting strategy and also to streamline it. It allows posting similar content to different social media platforms. 

    Cons of Cross Page Posting in ASP.NET:

    • The most observable disadvantage of this system is that it does not allow the exact or same data which may be a message across multiple platforms in social media.
    • It creates problems in formatting the page.
    • Lack of total control in the overall operational process.

    The Conclusion:

    In a nutshell, Cross Page Posting is always configured for personal or individual controls. As a result, it facilitates one to generate or create a page that posts to different pages. This, however, depends on the button the user clicks.

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