Answer Posted / chitransu verma

ExecuteNonQuery-It executes the DML
commonds(insert,update,delete)and retuns the number of
affected rows.

ExecuteScaler-Lightweight version on executenonquery.
used besically for singalton queries.
It executes the sql statements or stored procedures and
returns a scalar value form first column and first row.
It is used to execute aggregate function like
Avg().Count(*),Max(),Min() etc.When compare to ExecuteReader
It uses Fewer System Resources.

ExecuteReader-It execute sql statement and return the
DataReader Object.
It is used to select records from the tables stored in
database.

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