Answer Posted / surya narayana panda

ExecuteReader-It is readonly forward only.It executes the
command and return the reader objectl.It executes only
select command.

ExecuteNonQuery-It executes command and return's no
value.It returns only how many row effected.It returns
value when the commandType is stroedProcedure with output
parameter.

ExecuteScalar-It executes the command and return a single
value.That is 1st column and 1st row.

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