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. The Close method may either be called directly or through the Dispose method, disposing directly or in the context of the using statement block.
What is SqlDataReader?
The SqlDataReader is used to read a row of record at a time which is got using SqlCommand. It is read only, which means we can only read the record; it can not be edited. And also it is forward only, which means you can not go back to a previous row (record).
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 ..
Do I need to dispose SqlCommand?
“Not calling dispose on the command won’t do anything too bad.” True, but don’t get used to it; it’s only true for SqlCommand s. On the other hand, not disposing a SqlCeCommand , for example, will cause your mobile device to run out of memory quite fast.
Why do we use SqlDataReader?
SqlDataReader Properties It is used to get a value that indicates the depth of nesting for the current row. It is used to get the number of columns in the current row.
What does ExecuteScalar return?
ExecuteScalar() Method:ExecuteScalar() method is used to retrieve a single value from database. It executes the defined query and returns the value in the first column of the first row in the selected result set and ignores all other columns and rows in the result set.
What is SqlDataReader in asp net C#?
ADO.NET DataReader is used to store data returned from a database in a fast, forward-only, in-memory records. In this article, learn how to use a DataReader in a C# application.
How do I know if a dbdatareader contains multiple rows?
Gets a value indicating the depth of nesting for the current row. When overridden in a derived class, gets the number of columns in the current row. When overridden in a derived class, gets a value that indicates whether this DbDataReader contains one or more rows.
How to create a sqldatareader in SQL Server?
To create a SqlDataReader, you must call the ExecuteReader method of the SqlCommand object, instead of directly using a constructor. While the SqlDataReader is being used, the associated SqlConnection is busy serving the SqlDataReader, and no other operations can be performed on the SqlConnection other than closing it.
How do I get the number of rows in a DataReader?
Henk is right: there is no member of the DataReader that allows you to get the number of rows because it is a forward only reader. You are better off first doing getting the count and then executing the query, perhaps in a multi-result query so you only hit the database once. – flipdoubt Sep 5 ’09 at 13:29
What is the use of asynchronously in dbdatareader?
Asynchronously closes the DbDataReader object. Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. Releases all resources used by the current instance of the DbDataReader class.