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What is a Dataset object ?

Posted By :Subhransu Sekhar Jena     Posted Date :September 29, 2014    Points :40   Category :ADO.Net 
The DataSet is used to store data from a data source . It consists of a set of data tables. We can also specify the relation between the tables inside a dataset.

You can also find related Interview Question to What is a Dataset object ?  below: 

What is typed dataset in C#?

A typed dataset is similar to a dataset with only difference is that the sehema is already present in typed dataset. so if any mismatch in the column will generate compile time errors rather than runtime error as in the case of normal dataset. Also accessing the column value is much easier than the normal dataset as the column definition will be available in the schema. (More...)

What happens when we issue Dataset.ReadXml command?

Reads XML schema and data into the DataSet. (More...)

What is a Null object?

It is an object of some class whose purpose is to indicate that a real object of that class does not exist. One common use for a null object is a return value from a member function that is supposed to return an object with some specified properties but cannot find such an object. (More...)

What is Object Oriented model?

This model is based on collection of objects. An object contains values stored in instance variables with in the object. An object also contains bodies of code that operate on the object. These bodies of code are called methods. Objects that contain same types of values and the same methods are grouped together into classes. (More...)

What is the difference between Data Reader & Dataset?

Data Reader is connected datasource, read only, forward only record set.

Dataset is disconnected datatsource resides in memory database that can store multiple tables, relations and constraints; (More...)

Difference between Dataset and Datareader?

Data Set is a connectionless service and Data reader is a connection oriented service. Dataset is used to store the data, it contains collections of Datatable. Datareader is used to connect to the database for retrieving data.
Data Reader - Forward only where as Dataset - Can loop through dataset.
Data Reader - Connected Recordset where as DataSet - Disconnected Recordset
Data Reader - Less Memory Occupying where as DataSet - It occupies more memory
Data Reader - Only Single Table can be used where as Dataset - Datatable Concept allows data to be stored in multiple tables.
Data Reader - Read only where as DataSet - Can add/update/delete using the dataset
Data Reader - No relationship can be maintained where as DataSet - Relationship can be maintained.
Data Reader - No Xml Storage available where as DataSet - Can be stored as XML.
The Dataset is a core of disconnected architecture. Disconnected architecture means once you have retrieved the data from the database the data source is dropped. The disconnected data become very commonly. The dataset for the disconnected data from the Dataset object. The DataReader is a readonly, forward only stream from the database. While using the datareader can improve the application performance reduces the system overhead because only one buffer row at a time in memory.

Shashi Ray (More...)

How can I look up a parent class method or property of any System-level object?

Use the Class View window, accessed from the standard toolbar by clicking View | Class View. (More...)

How can we check that some changes have been made to dataset since it was loaded?


The changes made to the dataset can be tracked using the GetChanges and HasChanges methods.
The GetChanges returns dataset which are changed since it was loaded or since Acceptchanges was executed.

The HasChanges property indicates if any changes were made to the dataset since it was loaded or if acceptchanges method was executed.

The RejectChanges can be used to revert thee changes made to the dataset since it was loaded


What is object Reference Tracing?

Object Reference Tracing is record sequential stack traces each time whenever object reference counter is incremented or decremented. These traces help to detect object reference errors, double-dereferencing, failure to reference. (More...)

You are working with a DataSet and want to be able to display data, sorted different ways. How do you do so?

Select the correct answer.

1. Use the Sort method on the DataTable object.
2. Use the DataSet object's Sort method.
3. Use a DataView object for each sort.
4. Create a DataTable for each sort, using the DataTable object's Copy method, and then Sort the result

Correct Answer is :
3. Use a DataView object for each sort. (More...)

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