What is TransactionScope in asp net?

The TransactionScope class provides a simple way to mark a block of code as participating in a transaction, without requiring you to interact with the transaction itself. A transaction scope can select and manage the ambient transaction automatically.

How do you handle transactions in C#?

Here is the sample code to implement transactions in ADO.NET.

  1. string strConnString = “myconnectionstring”; // get it from Web.config file.
  2. SqlTransaction objTrans = null;
  3. using (SqlConnection objConn = new SqlConnection(strConnString))
  4. {
  5. objConn.Open();
  6. objTrans = objConn.BeginTransaction();

What is transaction scope in SQL Server?

Definition: TransactionalScope makes your code block Transactional. You can easily maintain one transaction for multiple databases or a single database with multiple connectionstrings, using TransactionScope. When you use TransactionScope there is no need to close any Database connections in the middle.

What is ambient transaction C#?

The ambient transaction is the transaction within which your code executes. You can obtain a reference to the ambient transaction by calling the static Transaction. Current property of the Transaction class.

How do I rollback a transaction in C#?

After that you assign a new SQL Insert to the CommandText and save the current transaction savepoint before executing the query. This Insert puts “Bob Hope” into the database.
…
Rollback, Commit, and Savepoints in ADO.NET.

METHOD DESCRIPTION
Rollback(SavePoint) Performs a roll back on a transaction to the previous database state.

What are SQL transactions?

A SQL transaction is a grouping of one or more SQL statements that interact with a database. A transaction in its entirety can commit to a database as a single logical unit or rollback (become undone) as a single logical unit. In SQL, transactions are essential for maintaining database integrity.

How do I rollback a transaction in Entity Framework?

A DbContextTransaction object provides Commit() and Rollback() methods to do commit and rollback on the underlying store transaction. This method requires an open underlying stored connection. This method opens a connection if it is not already open. This method will close the connection when Dispose () is called.

How do you use TransactionScope?

Using the TransactionScope

  1. Add a reference to System.
  2. Add a using System.
  3. Make sure that the Microsoft Distributed Transaction Coordinator is running.
  4. Create the TransactionScope object in a using statement.
  5. Complete all updates within the scope defined by the {} of the TransactionScope’s using statement.

What are the types of transactions in SQL Server?

SQL Server provides the following transaction statements:

  • BEGIN DISTRIBUTED TRANSACTION. ROLLBACK TRANSACTION.
  • BEGIN TRANSACTION. ROLLBACK WORK.
  • COMMIT TRANSACTION. SAVE TRANSACTION.
  • COMMIT WORK.

How do I know if ExecuteNonQuery is successful C#?

int a=NewCmd. ExecuteNonQuery(); if(a==0) //Not updated. else //Updated. ExecuteNonQuery() -> This function return integer value.

Can we rollback after COMMIT?

COMMIT permanently saves the changes made by the current transaction. ROLLBACK undo the changes made by the current transaction. 2. The transaction can not undo changes after COMMIT execution.

What is rollback in SQL?

What is ROLLBACK in SQL? ROLLBACK is a transactional control language in SQL. It lets a user undo those transactions that aren’t saved yet in the database. One can make use of this command if they wish to undo any changes or alterations since the execution of the last COMMIT.

What is lazy loading in Entity Framework?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

What is a DbContext?

A DbContext instance represents a combination of the Unit Of Work and Repository patterns such that it can be used to query from a database and group together changes that will then be written back to the store as a unit. DbContext is conceptually similar to ObjectContext.

What is isolation level in transaction?

Transaction isolation levels are a measure of the extent to which transaction isolation succeeds. In particular, transaction isolation levels are defined by the presence or absence of the following phenomena: Dirty Reads A dirty read occurs when a transaction reads data that has not yet been committed.

How do I rollback a delete in SQL?

If you want rollback data, firstly you need to execute autocommit =0 and then execute query delete, insert, or update.
FOR EXAMPLE:

  1. begin transaction.
  2. select * from Student.
  3. delete from Student where Id=2.
  4. select * from Student.
  5. rollback.
  6. select * from Student.

What is the difference between ExecuteNonQuery () and ExecuteScalar ()?

It will be used when Sql query returns single value. Show activity on this post. ExecuteNonQuery – Use this operation to execute any arbitrary SQL statements in SQL Server if you do not want any result set to be returned.

What is difference between ExecuteReader and ExecuteNonQuery?

ExecuteReader() returns an object that can iterate over the entire result set. ExecuteNonQuery() does not return data at all: only the number of rows affected by an insert, update, or delete.

Can we COMMIT inside a trigger?

You can’t commit inside a trigger anyway. Show activity on this post. Trigger should not commit and cannot commit. Committing in a trigger usually raises an exception unless it happens into autonomous transaction.

Can we rollback truncate?

You cannot ROLLBACK TRUNCATE

Simply, you cannot rollback a transaction if it is already committed but you can do something else to get the data back (or at least some parts of it). When you execute the TRUNCATE statement, your data is still in the MDF file.

What is trigger in SQL?

A trigger is a special type of stored procedure that automatically runs when an event occurs in the database server. DML triggers run when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE statements on a table or view.

Can we ROLLBACK after COMMIT?

What is difference between eager and lazy loading?

Lazy Loading vs. Eager Loading. While lazy loading delays the initialization of a resource, eager loading initializes or loads a resource as soon as the code is executed. Eager loading also involves pre-loading related entities referenced by a resource.

What is proxy in Entity Framework?

When creating instances of POCO entity types, Entity Framework often creates instances of a dynamically generated derived type that acts as a proxy for the entity. This proxy overrides some virtual properties of the entity to insert hooks for performing actions automatically when the property is accessed.

What is the difference between DbContext and DbSet?

Intuitively, a DbContext corresponds to your database (or a collection of tables and views in your database) whereas a DbSet corresponds to a table or view in your database.