Answer Posted / jerry joseph

ExecuteReader - This method returns a DataReader which is
filled with the data that is retrieved using the command
object.

ExecuteNonQuery - This method returns no data at all. It is
used majorly with Inserts and Updates of tables.

ExecuteScalar - Returns only one value after execution of
the query. It returns the first field in the first row.

This would be excellent for receiving a count of records
(Select Count(*)) in an sql statement, or for any query
where only one specific field in one column is required.

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