How to configure distributed transactions in SQL Server?

To configure distributed transactions in SQL Server, the following steps are required:

1. Make sure that the Distributed Transaction Coordinator (DTC) is installed. DTC is a Windows service that coordinates the processing of distributed transactions. You can install and configure DTC through the Windows Component Services Manager.
2. Configure SQL Server to support distributed transactions. This can be done through SQL Server Management Studio (SSMS) or SQL Server Configuration Manager.
3. In SSMS, open the server object, right-click on “Server Properties”, and enable the “Enable Distributed Transactions” option in the “Connections” tab.
4. In SQL Server Configuration Manager, expand the “Services” node, locate the corresponding SQL Server instance, right-click on “Distributed Transaction Coordinator”, select “Properties”, and enable “Enable network DTC access” in the “Local DTC” tab.
5. Using distributed transactions in your application involves starting and managing them through the TransactionScope class. Make sure to connect to all the databases involved and create a TransactionScope object at the beginning of the transaction. After the transaction is complete, either use the Complete method to commit the transaction or the Dispose method to roll it back.
6. Below is an example code:
7. With a TransactionScope, the actions within SqlConnection connections are performed and then the transaction is committed.
8. In the code above, connectionString1 and connectionString2 are the connection strings for two different databases being used.

After configuring distributed transactions, SQL Server will be able to coordinate and manage transaction operations involving multiple databases.