When do Entity Framework Database Connections open and close?

Entity Framework intentionally closes connections

It is not necessary because ...Dispose... invoked by using statement will handle it. But it is good habit to explicitly call ...Close... once you know that connection will not be needed any more. For example you don't know how complex the disposal is so you want to free database connection wrapped by entity connection as soon as possible.

When doing many updates in Entity Framework 4, how do you avoid locking the database?

Those locks are not created by Entity Framework. EF only supports optimistic concurrency, pessimistic locking is not supported with EF....I think the locking you experience is a result of your SQL Server configuration. Perhaps if your Transaction Isolation Level on the server is set to REPEATABLE READ this might cause the locks after each query. Bu...

The underlying provider failed on Open in entity framework connection

I don't know why you get this error but I use this connection string and I don't have any problem. remember the name of the DbContext class and connection string should be same...<add name="MyDB" connectionString="Server=127.0.0.1;User ID=sa;Password=password;Database=Database" providerName="System.Data.SqlClient"/>

Manually open and close connection with entity framework

I don't know how to do it on VB, but with C# you can try to do something like this:... var datacontext = new EbosEntities(); try { datacontext.Connection.Open(); //do some work } finally { datacontext.Connection.Close(); }

Connection closed when doing Transaction rollback on Mysql with Entity Framework 6 and Devart provider

The bug, related to the "Connection must be opened" error when rolling back a transaction if a connection has been already closed, is fixed....New version of dotConnect for MySQL 8.1 is released. It can be downloaded from ...here... (trial version) or from Registered Users' Area (for users with active subscription only). For more information, pleas...

EF: Should I explicitly close database connection when calling OpenConnection manually

Usually EF opens and closes the connections automatically before/after an operation is completed. However if you open a connection manually, EF will NOT close it for you after a database operation is completed. ...It is best practice to close a connection if you don't need it. It's also best practice for the DbContext to be short-lived (if it's pos...

Entity Framework 6 error serverversion : (System.Data.SqlClient.SqlConnection)customerOrderContext.Database.Connection).ServerVersion

The exception is ...documented... and it's because the connection is closed. There is no problem with this. ...But obviously you get empty result because you didn't use the result, you are just returning ...new List<BusinessObjects.Customers>()... in your method:...public IEnumerable<BusinessObjects.Customers> GetAllCustomers() { IList<Business...

Entity Framework Hangs After Query Completes Before Connection is Closed

2018-09-07 14:10:46,421 ...1... INFO EntityDataRepository [jobInstanceID: 0] - -- Completed in 11776 ms with result: SqlDataReader...That means that ...SqlCommand.ExecuteReader()... has completed, and the server is starting to return rows to the client. The query in SQL Sever is ...still executing... at this point. It may have spooled all the que...

.net core web api close database connection

The easiest solution is to use ...using... block. This will take care of database connection closing automatically and you don't have to manually close the database connection....eg....using (SqlConnection connection = new SqlConnection(connectionString)) { // Your database code }

System.Data.SQLite.SQLiteException: unable to open database file (An exception occurred while initializing the database)

This looks like a permission issue... System.Data.SQLite.SQLiteException: unable to open database file ...The database-file is set to ...c:\mydb.sqlite... in app.config connectionString... <connectionStrings> <add name="ConnectionString" connectionString="Data Source=c:\mydb.sqlite" providerName="System.Data.SQLite"/> </connectionSt...