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Table of contents
1.
Introduction
2.
Introduction to ADO.NET
3.
Benefits of ADO.NET
4.
Scope of ADO.NET
5.
Commonly Asked ADO.NET Interview Questions and Answers
5.1.
1. What is ADO.NET?
5.2.
2. What are the two significant objects of ADO.Net?
5.3.
3. Explain the difference between ADO and ADO.Net?
5.4.
4. What are the various layers of ADO.Net?
5.5.
5. What is DataSet in ADO.NET?
5.6.
6. How to fill a dataset with multiple tables?
5.7.
7. What is a DataAdapter in ADO.NET?
5.8.
8. Make sense of DataSet types in ADO.NET.
5.9.
9. What are the components of ADO.NET data provider?
5.10.
10. Which namespace is used to connect database?
5.11.
11. What is a DataReader Object?
5.12.
12. Explain the difference between Datareader and Dataset?
5.13.
13. Explain the differences between OLEDB and SQLClient Providers?
5.14.
14. What are the different execute() methods available in ADO.NET?
5.15.
15. What is meant by data binding in ADO.NET?
5.16.
16. What is object pooling?
5.17.
17. What is information restricted in ADO.NET?
5.18.
18. What is ADO.NET with the model?
5.19.
19. What are ADO.NET and types?
5.20.
20. What is ADO.NET's complete structure?
5.21.
21. Is ADO.NET a Framework?
5.22.
22. What is object pooling?
5.23.
23. What is an exchange in ADO.NET? Make sense of the kinds of deals accessible in ADO.NET.
5.24.
24. What is information restricted in ADO.NET?
5.25.
25. What is the use of a connection object?
5.26.
26. What is Connection pooling?
5.27.
27. What is DataTable in ADO.NET?
5.28.
28. What namespaces are available in ADO.NET for different functionalities?
5.29.
29. What are the circumstances for association pooling?
5.30.
30. What are the information suppliers in ADO.NET?
5.31.
31. Sense of ADO.NET Architecture.
5.32.
32. Make sense of about ExecuteScalar() in ADO.NET.
5.33.
33. Explain the concepts of boxing and unboxing.
5.34.
34. What is LINQ?
5.35.
35. Explain the difference between Response.Expires and Reponse.ExpiresAbsolute?
5.36.
36. What is the distinction among Dataset.Clone() and DataSet.Copy() strategies?
5.37.
37. Which techniques are given to add or eliminate columns from the DataTable article?
5.38.
38. What is serialization? Compose a model program to serialize a DataSet.
5.39.
39. What are the methods of an XML dataset object?
5.40.
40. How might you distinguish whether any progressions have been made to the DataSet protest since it was last stacked?
6.
Conclusion
Last Updated: Mar 27, 2024
Medium

40 Most Asked ADO.NET Interview Questions and Answers 2024

Author Adya Tiwari
0 upvote

Introduction

ADO.NET is an innovation utilized for information and is given by the Microsoft .NET Framework. It is a piece of the .Net structure that upholds the correspondence among social and non-social frameworks with the assistance of a bunch of programming parts. It upholds disengaged design utilizing which software engineers can get information and administrations from a data set without contingent upon the information source.

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This article includes all the essential ADO.NET interview questions you will need for your following ADO.NET interview.

Introduction to ADO.NET

ADO.NET has contained a gathering of underlying classes that are valuable for laying out the information base association, accessing XML, social information, and application information, and recovering an outcome. It tends to be utilized in different programming dialects, for example, Visual Basic.NET, Visual C++, and so on, that are upheld by the .NET structure.

Apart from ADO.NET interview questions, we have also covered the benefits and scope of ADO.NET below.

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Benefits of ADO.NET

ADO.NET enjoys different benefits, which can be sorted into the accompanying classes:

  • Interoperability: It gives the capacity to impart across heterogeneous conditions when the association has been laid out between them.
  • Adaptability: It gives the capacity to serve a rising number of clients without diminishing the exhibition of the framework. So we can say that ADO.NET is profoundly versatile because it is sufficiently adaptable to be effortlessly extended when there is a prerequisite for the equivalent.
  • Efficiency: It gives the capacity to quickly foster robust applications for information access utilizing rich and extensible part object models provided by the ADO.NET.
  • Execution: An improvement over prior ADO.NET adaptations on the detached information model. It can lay out associations rapidly to get information immediately.

Also Read: Java OOPs Interview Questions

Scope of ADO.NET

ADO.NET being one of the results of Microsoft, situating itself firmly in the market is adequate. ADO.NET has enormous local area support, so it has a considerable degree ahead. You could learn ADO.NET alongside involved insight on the .Net framework to have a decent extension. Any full-stack engineer who has a superior hold over both front-end and back-end innovation can definitively learn ADO.NET.

Now without waiting anymore, let's get on with the ADO.NET Interview Questions.

Commonly Asked ADO.NET Interview Questions and Answers

1. What is ADO.NET?

ADO.NET represents ActiveX Data Object; it is a piece of the .NET Framework by Microsoft. ADO.NET structure gives a bunch of classes that are utilized to deal with information correspondence with information sources, for example, XML documents and data sets (for example, SQL, Oracle, MySQL, MS Access, and so on.).
ADO.NET can isolate information networks, information access, and information control instruments.

2. What are the two significant objects of ADO.Net?

There are two objects that consist of two components as follows:

Connection model: This is the .NET data provider where a set of components, including the connection, command, DataReader, and DataAdapter objects, is eventually known as provider objects.

Disconnected model: This is the main component which is nothing but a DataSet that is eventually known as common objects.

3. Explain the difference between ADO and ADO.Net?

ADO: ADO is a component of MDAC (Microsoft Access Component), which is based on COM (Component Object Modelling). ADO has a feature of locking, and the data is stored in binary form.

ADO.Net: ADO.Net is an advanced database technology from Microsoft .NET framework which provides communication between the application system and the database server.

4. What are the various layers of ADO.Net?

There are three layers of ADO.Net, which are as follows: Presentation Layer, Business Logic Layer, and Database Access Layer.

5. What is DataSet in ADO.NET?

The DataSet is an assortment of information base tables(row and segment design) that contain the information. It helps bring the information with next to no requirement for Data Source collaboration; for that reason, it is known as a separated information access technique.
It is an in-memory information store that can contain different tables simultaneously. DataRelation articles can be utilized to relate these tables.

DataSet in ADO.NET

 

6. How to fill a dataset with multiple tables?

The DataAdapter class is used to fetch the data from different numbers of data sources and populate the dataset by which the multiple tables can be filled with the datasets.

7. What is a DataAdapter in ADO.NET?

A DataAdapter is utilized to get information from an information source by working as a scaffold between DataSet and an information source. The DataAdapter class incorporates a SQL order set and a data set association. It is helpful to fill the DataSet and resolve changes to the information source.
DataAdapter properties that license the client to control the information base are the Select orderUpdate orderInsert order, and Delete order.
Model code for the use of DataAdapter:
 

using System;  
using System.Data.SqlClient;  
using System.Data;  
namespace DataAdapterExample  
{  
    public partial class DataAdapterDemo : System.Web.UI.Page  
    {  
        protected void Page_Load(object sender, EventArgs e)  
        {  
            using (SqlConnection conn = new SqlConnection("data source=.; database=items; integrated security=SSPI"))  
            {  
                SqlDataAdapter da = new SqlDataAdapter("Select * from items", conn);  
                DataSet s = new DataSet();  
                da.Fill(s);  
                GridView1.DataSource = s;  
                GridView1.DataBind();  
            }  
        }  
    }  
}  

8. Make sense of DataSet types in ADO.NET.

DataSet is an assortment of data set tables(row and segment design) that holds the information. There are two sorts of DataSet in ADO.NET. They are:

Composed DataSet: A composed DataSet is gotten from the DataSet base class and can be made by choosing the DataSet choice given by Visual Studio. It will be made as an XML schema(.xsd record) that contains DataSet structure data like lines, segments, and tables. Information from the data set is moved into a dataset and from the dataset to one more part in the XML design.

Untyped DataSet: Untyped DataSet doesn't have a related XML blueprint. Clients should add sections, tables, and different components to it. Properties can be set during configuration time or added during run time.

Model program for the use of DataSet:

using System;  
using System.Data.SqlClient;  
using System.Data;  
namespace DataSetDemo  
{  
    public partial class DataSetExample : System.Web.UI.Page  
    {  
        protected void Page_Load(object sender, EventArgs e)  
        {  
            using (SqlConnection conn = new SqlConnection("data source=.; database=employee; integrated security=SSPI"))  
            {  
                SqlDataAdapter da = new SqlDataAdapter("Select * from employee", conn);  
                DataSet d = new DataSet();  
                da.Fill(d);  
                GridView1.DataSource = d;  
                GridView1.DataBind();  
            }  
        }  
    }  
} 


9. What are the components of ADO.NET data provider?

There are a total of five components of the ADO.NET data provider are as follows:

  • Connection
  • Command
  • DataReader
  • DataAdapter
  • DataSet

10. Which namespace is used to connect database?

The namespace System.Data is used to connect the database in ADO.NET. The ActiveX Data Objects for.NET (ADO.NET) technology, which offers a collection of classes for data access and manipulation, includes this namespace.

11. What is a DataReader Object?

DataReader Object is a fundamental component of ADO.NET. It is a read-only cursor that is basically used to retrieve the data from a database efficiently. The DataReader is designed for scenarios where you need to fetch a large dataset and read it sequentially, without the need for updating or modifying the data.

12. Explain the difference between Datareader and Dataset?

DataReader Object is a read-only cursor that is basically used to retrieve the data from a database efficiently.

The dataset is an in-memory representation of data that offers multiple tables, relationships, and updates.

13. Explain the differences between OLEDB and SQLClient Providers?

OLEDB is a data provider which basically works on various data sources. SQLClient is also a provider that is specifically designed for Microsoft SQL Server.

14. What are the different execute() methods available in ADO.NET?

The different execute() methods that are available in ADO.NET are:-

  • ExecuteNonQuery()
  • ExecuteScalar()
  • ExecuteReader()

15. What is meant by data binding in ADO.NET?

Data Binding in ADO.NET is the process that establishes a connection between the application UI and business logic. Users can engage with the data without having to manually manage data retrieval and update processes due to its smooth data synchronisation between the data source and the user interface (UI).

By requiring less code to show, edit, and update data in the UI, it makes it easier to design data-driven apps.

16. What is object pooling?

Object pooling is a vault of the items in memory that can be reused later without making them. This article states that pooling lessens the weight of making objects when required. Whenever there is a prerequisite for an item, the item pool director will deal with the solicitation and serve in a like manner. It is intended for advancing the utilization of restricted assets, so the requests of client solicitations will be satisfied.

17. What is information restricted in ADO.NET?

Information restricting in ADO.NET is the cycle through which UI (UI) controls of a client application are designed to refresh or get information from sources like a data set or XML report. Utilizing information restricting, the client will want to tie values to the specific control.

There are two kinds of information restricting given the sort of slowing advertised:

Straightforward information restricting: It is the most common way of limiting the control with just a single worth in the dataset. The rules, for example, name, and text box, will be bound to the control utilizing the control properties.

Complex Information Restricting: Complex information restriction is the strategy for limiting the part of the Database. The controls can be a Dropdown list, GridView, or combo box. One or beyond what one is worth can be shown from the dataset utilizing the mind-boggling information restricting.

18. What is ADO.NET with the model?

ADO.NET is a bunch of classes that uncover information access administrations. NET Framework developers. ADO.NET gives a rich arrangement of parts for making disseminated, information-sharing applications. It is a fundamental piece of the. NET Framework, giving admittance to social, XML, and application information.

19. What are ADO.NET and types?

ADO.NET is a bunch of classes (a structure) to cooperate with information sources, for example, data sets and XML documents.

20. What is ADO.NET's complete structure?

ADO represents ActiveX Data Objects. ADO is a Microsoft Active-X part. ADO is consequently introduced with Microsoft IIS. ADO is a programming connection point to get information in a data set.

21. Is ADO.NET a Framework?

ADO.NET is the information access part for the. NET Framework. ADO.NET use the force of XML to give detached admittance to information.

22. What is object pooling?

Object pooling is a vault of the items in memory that can be reused later without making them. This article states that pooling decreases the weight of making objects when required. When there is a prerequisite for an item, the article pool chief will handle the solicitation and serve likewise. It is intended to improve the utilization of restricted assets with the goal that the requests of client solicitations will be satisfied.

23. What is an exchange in ADO.NET? Make sense of the kinds of deals accessible in ADO.NET.

In ADO.NET, exchanges are utilized when you need to tie a few errands together and execute them as a solitary unit. The deal gives information consistency by guaranteeing that the data set tasks will all succeed, or everyone will be fizzled. For instance, consider an application that performs two undertakings. In the first place, it refreshes an item_order table with request data. Second, it refreshes an item_inventory table that holds stock data, where various things requested will be charged. If any undertakings fizzle, the two updates should be moved back.

24. What is information restricted in ADO.NET?

Information restricting in ADO.NET is the cycle through which User Interface (UI) controls of a client application are designed to refresh or bring information from information sources like a data set or XML record. Utilizing information restricting, the client will want to tie values to the specific control.

25. What is the use of a connection object?

One of the uses of a connection object is for the establishment of the connection between the data source. For example, a database can be a data source where the operations like data retrieval, and commands execution can be done.

26. What is Connection pooling?

The undertaking of collection data set associations in the storage memory is to make them accessible at whatever point there is a necessity of association. Opening another information base association each time is a tedious cycle. Association pooling permits you to reuse existing and dynamic information base associations, at whatever point there is a need, and hence builds the application execution.

27. What is DataTable in ADO.NET?

DataTable in ADO.NET addresses a solitary table in a DataSet that has in-memory social information. The information inside DataTable is near the .NET structure-based application in which it has a place; however, it can be populated utilizing a DataAdapter from various information sources like Microsoft SQL Server. The DataTable class has a position with the System—data namespace inside the library of the .NET Framework.

28. What namespaces are available in ADO.NET for different functionalities?

There are different namespaces that are available in ADO.NET for different functionalities, which are as follows:

System.Data: System.Data namespace can be used for the core ADO.NET classes.

System.Data.SqlClient: System.Data.SqlClient namespace can be used for SQL server-specific data access.

System.Data.OleDb: System.Data.OleDb is basically used for OLE DB data access.

System.Data.OracleClient: System.Data.OracleClient namespace can be used for Oracle-specific data access.

29. What are the circumstances for association pooling?

The circumstances for association pooling are:

There should be a few cycles with similar boundaries and security settings so they can have a similar association.

The association string ought to be indistinguishable. 

30. What are the information suppliers in ADO.NET?

Information suppliers are accustomed to moving the information between the client application and the information store. It embodies the information base explicit subtleties. Information suppliers are helpful for data set association, information recovery, storing the information in a dataset, perusing the recovered information, and refreshing the data set.

See more, Kotlin Interview Questions

31. Sense of ADO.NET Architecture.

ADO.NET depends on an Object Model where information dwelling in the data set is obtained by utilizing an information supplier. It is an innovation of information access given by the Microsoft .Net Framework, which assists with imparting among social and non-social frameworks using a typical gathering of parts.

Sense of ADO.NET Architecture

 

32. Make sense of about ExecuteScalar() in ADO.NET.

A solitary worth from the main line and first section of the ResultSet will be returned by ExecuteScalar() strategy on inquiry execution.

Assuming the ResultSet has various lines or segments, that multitude of bars and sections will be disregarded aside from the top rope and first segment. If the ResultSet is vacant, this capability will bring NULL back.

The best circumstance to utilize ExecuteScalar() strategy is the point at which we are using capabilities like COUNT()SUM(), and so forth, as it utilizes a couple of assets contrasted with the ExecuteReader() technique.

33. Explain the concepts of boxing and unboxing.

When a value type is converted into an object type, this process is called boxing. For example, the int data type can be converted into an object data type.

When an object type is converted into a value type, this process is called unboxing. For example, an object data type can be converted into a double data type.

34. What is LINQ?

LINQ(Language Integrated Query) is an organized question sentence structure that helps the developers and analyzers to recover information from different information sources, for example, Collections, XML Docs, ADO.NET DataSet, web administration, MS SQL Server, and so on.

It is coordinated with C# or VB.NET and disposes of the confounding between various programming dialects and information bases. It gives a solitary questioning connection point to different information source types.

35. Explain the difference between Response.Expires and Reponse.ExpiresAbsolute?

Response.Expires is the property that specifies the number of minutes before a page cached in the browser expires.

Response.ExpresAbsolute is the property where the date or time can be set at which the page cached in the browser expires.

36. What is the distinction among Dataset.Clone() and DataSet.Copy() strategies?

The technique Clone() duplicates just the DataSet structure. The replicated design will have every one of the imperatives, relations, and DataTable patterns utilized by the DataSet. It doesn't duplicate the information put away in the DataSet.

The Copy() strategy duplicates the DataSet structure alongside the information in the DataSet. The first information won't be impacted.

37. Which techniques are given to add or eliminate columns from the DataTable article?

The DataRowCollection class has characterized the assortment of lines for the DataTable item. DataRowCollection class has NewRow () strategy for adding another DataRow to DataTable. This strategy makes another column that carries out the similar blueprint applied to the DataTable.

38. What is serialization? Compose a model program to serialize a DataSet.

Serialization is the technique for changing an item into a byte stream which can be put away and communicated over the organization. The upside of serialization is that information can be sent in a cross-stage climate across the organization. Furthermore, it very well may be saved in a capacity medium like relentless or non-tireless.

The code for serializing a DataSet is:

using System;
using System.Data;
using System.Data.SqlClient;
using System.Xml.Serialization;
using System.IO;
public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection("Data Source=data_source_name;Initial Catalog=employee;Integrated Security=True");  //Create connection object
        SqlDataAdapter da = new SqlDataAdapter("select * from emp", conn);  //DataAdapter creation
        DataSet s = new DataSet();
        da.Fill(s);  
        FileStream fObj = new FileStream("C:\\demo.xml", FileMode.Create);   // Create a XML file
        XmlSerializer sObj = new XmlSerializer(typeof(DataSet));
        sObj.Serialize(fObj, s);  //Serialization of a DataSet
        fObj.Close();
    }
}

 

39. What are the methods of an XML dataset object?

There are several methods of XML dataset object, as follows: WriteXml(), ReadXml(), GetXml(), ReadXmlSchema(), and WriteXmlSchema(). All these methods are used to read and write XML data that is basically associated with the dataset.

40. How might you distinguish whether any progressions have been made to the DataSet protest since it was last stacked?

The DataSet object has two techniques to find the changes:

GetChanges(): It returns the DataSet object that has been changed since it was stacked or since the execution of the AcceptChanges() strategy.

Changes (): It shows if any changes were made from when the DataSet object was stacked or after a technique called the AcceptChanges() was created.

Utilize the RejectChanges() technique to invert the whole changes since from the time the DataSet object was stacked.

Conclusion

You have reached the end of this article, ADO.NET Interview Questions. These are all the ADO.NET interview questions that you need to know. ADO.NET is an innovation utilized for information and is given by the Microsoft .NET Framework. It is a piece of the .NET structure that upholds the correspondence among social and non-social frameworks with the assistance of a bunch of programming parts. It keeps detached engineering utilizing which developers can get information and administration from a data set without contingent upon the information source. ADO.NET being one of the results of Microsoft, situating itself unequivocally in the market is adequate. ADO.NET has tremendous local area support, which undoubtedly has a considerable degree ahead. You could learn ADO.NET alongside the operational experience and use these ADO.NET Interview Questions to ace your interview. 

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