70-305 Developing and Implementing Web Applications with Microsoft Visual Basic.NET
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Demo Question 1.
You work as the Web developer at EliteCertify.com. You are developing a new user interface that will calculate the outstanding balances of clients whom have purchased products. Choose the method you should use to query the database.
A. Read method
B. ExecuteNonQuery method
C. ExecuteScalar method
D. ExecuteReader method
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Answer: C
The ExecuteScalar method of the Command class returns the value of the first row and first column that is
returned by the query. Because the method only returns a single value, it is appropriate for stored procedures
and queries that return one value. The Read method of the DataReader class moves the reader to the next
record. The ExecuteNonQuery method of the Command class executes queries, such as DELETE or
UPDATE, that do not return a value. The ExecuteReader method of the Command class builds a reader with
data that satisfies the CommandText property.
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