Answer Posted / ashish kumar gupta

Execute Reader: Use for accessing data. It provides a
forward-only, read-only (Select), connected record set.

Execute Non Reader: Use for data manipulation, such as
Insert, Update, and Delete.

Execute Scalar: Use for Retrieving 1 row 1 col. Value. I.e.
single value. E.g. for retrieving aggregate function. It is
faster than other ways of retrieving a single value from
database.

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