Do you need to close SqlDataReader?
You must ensure the Close method is called when you are through using the SqlDataReader before using the associated SqlConnection for any other purpose. The Close method may either be called directly or through the Dispose method, disposing directly or in the context of the using statement block.
How do you check if a DataReader is closed or opened in C#?
using (SqlDataReader rdr = MySqlCommandObject. ExecuteReader()) { while (rdr. Read()) { //… } } // The SqlDataReader is guaranteed to be closed here, even if an exception was thrown. This is the way we do it as well.
Does closing DataReader close connection?
There is already an open datareader associated with this connection which must be closed first. InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first…….or Join us.
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How do you fix there is already an open DataReader associated with this Command which must be closed first?
Close the DataReader & then SqlConnection, if there is an exception is not getting closed. best practices to write this code in try catch finally block. in finally block close the objects.
How do I turn off DataReader in C#?
You should always call the Close method when you have finished using the DataReader object….The following code example iterates through a DataReader object, and returns two columns from each row.
- while (myReader.Read())
- Console. WriteLine(“\t{0}\t{1}”, myReader. GetInt32(0), myReader. GetString(1));
- myReader. Close();
Does ExecuteReader close connection?
Ultimately it is the Close method of the data reader that will close the connection, provided nothing has gone wrong before. If there is an exception that occurs inside ExecuteReader or any of its called methods, before the actual DataReader object is constructed, then no, the connection will not be closed.
What is CommandBehavior CloseConnection?
ExecuteReader(CommandBehavior. CloseConnection); The associated connection will be closed automatically when the Close method of the Datareader is called. This makes it all the more important to always remember to call Close on your datareaders.
How do I close a DataReader in VB net?
3 Answers. The best way is to use the Using -statement which ensures that unmanaged resources are disposed(even on error). This also closes the reader.
How do I close an execute reader in VB net?
What is difference between SqlDataReader and SqlDataAdapter?
A SqlDataAdapter is typically used to fill a DataSet or DataTable and so you will have access to the data after your connection has been closed (disconnected access). The SqlDataReader is a fast forward-only and connected cursor which tends to be generally quicker than filling a DataSet/DataTable.
How can we force the connection object to close after my DataReader is closed?
How can we force the connection object to close after my datareader is closed? user using() to free the memory allocated for resource . We can use “CommandBehaviour. CloseConnection” Like as :SqlCommand cmd = new SqlCommand(“SELECT * FROM EMPLOYEE”, con);con.