Does DataReader dispose close the connection?

Does DataReader dispose close the connection?

Do not call Close or Dispose on a Connection, a DataReader, or any other managed object in the Finalize method of your class.

How do I close a DataReader?

The following code example iterates through a DataReader object, and returns two columns from each row.

1. while (myReader.Read())
2. Console. WriteLine(“\t{0}\t{1}”, myReader. GetInt32(0), myReader. GetString(1));
3. myReader. Close();

What is DataReader in asp net?

The DataReader is the solution for forward streaming data through ADO.NET. The data reader is also called a firehose cursor or forward read-only cursor because it moves forward through the data.

Do you need to close SqlDataReader?

You do not need to explicitly close it. BTW the SqlCommand in your example is disposable. You should create it in a using block too, otherwise any resources it controls won’t be let go until the garbage collector collects.

What is difference between ExecuteReader ExecuteNonQuery and ExecuteScalar?

ExecuteScalar() only returns the value from the first column of the first row of your query. 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.

Is the main method of DataReader?

It is used to get the value of the specified column in its native format. It is used to populate an array of objects with the column values of the current row. It is used to read record from the SQL Server database. To create a SqlDataReader instance, we must call the ExecuteReader method of the SqlCommand object.

What is CommandBehavior CloseConnection?

If you use CommandBehavior. CloseConnection, then in each loop, you will release the connection back to the pool, and the next iteration can re-use it. As a result your process will run faster and can get away with many fewer connections.

How do you close a SQL command?

SqlConnection Class

1. Open() : The open() method is used to open the Database connection.
2. Close() : The close() method is used to close the Database connection.
3. Look at the following code.
4. CommandText: The commandText property is used to set the SQL statement.

Can A DataReader be opened while the connection is closed?

While a DataReader is open, the Connection is in use exclusively by that DataReader. You cannot execute any commands for the Connection, including creating another DataReader, until the original DataReader is closed.

What happens when you close A DataReader in Microsoft Office?

Closing the DataReader. While a DataReader is open, the Connection is in use exclusively by that DataReader. You cannot execute any commands for the Connection, including creating another DataReader, until the original DataReader is closed.

How to retrieve data from a DataReader in C #?

To retrieve data using a DataReader, create an instance of the Command object, and then create a DataReader by calling Command.ExecuteReader to retrieve rows from a data source. The DataReader provides an unbuffered stream of data that allows procedural logic to efficiently process results from a data source sequentially.

When do you use a DataReader in SQL?

The DataReader is a good choice when you’re retrieving large amounts of data because the data is not cached in memory. The following example illustrates using a DataReader, where reader represents a valid DataReader and command represents a valid Command object.