What is the difference between ExecuteReader, ExecuteNonQuery and ExecuteScalar
ExecuteNonQuery
ExecuteNonQuery method will return number of rows effected with
INSERT, DELETE or UPDATE operations. This ExecuteNonQuery method will
be used only for insert, update and delete, Create, and SET
statements. (Read More about ExecuteNonQuery)
SqlCommand.ExecuteNonQuery MSDN Documentation
ExecuteReader
Execute Reader will be used to return the set of rows, on execution of
SQL Query or Stored procedure using command object. This one is
forward only retrieval of records and it is used to read the table
values from first to last.(Read More about ExecuteReader)
SqlCommand.ExecuteReader MSDN Documentation
Execute Scalar
Execute Scalar will return single row single column value i.e. single
value, on execution of SQL Query or Stored procedure using command
object. It’s very fast to retrieve single values from database. (Read
More about Execute Scalar)
SqlCommand.ExecuteScalar MSDN Documentation
