How do I close SqlDataReader?
When the return values and the number of records affected by a query are not significant, the time that it takes to close the SqlDataReader can be reduced by calling the Cancel method of the associated SqlCommand object before calling the Close method.
Do I 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. Do not call Close or Dispose on a Connection, a DataReader, or any other managed object in the Finalize method of your class.
Is it necessary to manually close and dispose of SqlDataReader?
4 Answers. The using statement will ensure correct disposal of the object and freeing of resources. If you forget then you are leaving the cleaning up to the garbage collector, which could take a while.
Does SqlDataReader close connection?
1) Yes, DataReader. Close() will close the connection. This is relevant when dealing with any connected object.
What does SqlDataReader return?
While a DataReader is open, you can retrieve schema information about the current result set using the GetSchemaTable method. GetSchemaTable returns a DataTable object populated with rows and columns that contain the schema information for the current result set.
What is MultipleActiveResultSets true?
It can be enabled by adding the “MultipleActiveResultSets=True” keyword pair to your connection string. “True” is the only valid value for enabling MARS. The following example demonstrates how to connect to an instance of SQL Server and how to specify that MARS should be enabled.
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 does ExecuteReader return?
ExecuteReader will return the DataReader object. ExecuteNonQuery() : Doesn’t return any data but returns affected row count. Return type is integer. ExecuteScalar Method(): It returns the value only in the first column of the first row.
What does ExecuteScalar return?
ExecuteScalar: Use this operation to execute any arbitrary SQL statements in SQL Server to return a single value. This operation returns the value only in the first column of the first row in the result set returned by the SQL statement. An example might be SELECT @@IDENTITY AS ‘Identity’.
Is SqlDataReader faster than SqlDataAdapter?
SqlDataReader will be faster than SQlDataAdapter because it works in a connected state which means the first result is returned from query as soon as its available ..
When should I use DataReader and DataAdapter?
DataReader requires an open connection in order to execute the SQL statement. Example would be fetching Name City for all records in the Person Table using DataReader. DataAdapter is used to execute SQL statements and is used to populate the results of SQL Query into a DataSet or DataTable.
When to call the close method in sqldatareader?
You must explicitly call the Close method when you are through using the SqlDataReader to use the associated SqlConnection for any other purpose. The Close method fills in the values for output parameters, return values and RecordsAffected, increasing the time that it takes to close a SqlDataReader that was used to process a large or complex query.
Is it necessary to manually close and dispose of sqldatareader?
Note that disposing a SqlDataReader instantiated using SqlCommand.ExecuteReader () will not close/dispose the underlying connection. There are two common patterns.
Do you call close or dispose on a DataReader?
Do not call Close or Dispose on a Connection, a DataReader, or any other managed object in the Finalize method of your class. In a finalizer, you should only release unmanaged resources that your class owns directly. If your class does not own any unmanaged resources, do not include a Finalize method in your class definition.
How to wrap sqldatareader in a USING statement?
To be safe, wrap every SqlDataReader object in a using statement. Just wrap your SQLDataReader with “using” statement. That should take care of most of your issues.