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Monday, 21 September 2015

ADO.NET Interview Questions and Answers for freshers pdf free download

6 :: Explain ExecuteNonQuery?
// Summary:

// Executes a Transact-SQL statement against the connection and returns the number of rows affected.

// Returns:

// The number of rows affected.

7 :: What is the ExecuteScalar method?
// Summary:

Executes the query, and returns the first column of the first row in the result set returned by the query. Additional columns or rows are ignored.

// Returns:

The first column of the first row in the result set, or a null reference (Nothing in Visual Basic) if the result set is empty.

8 :: Which one of the following objects is a high-level abstraction of the Connection and Command objects in ADO.NET?
DataReader DataSet DataTable DataView DataAdapter

Answer: DataAdapter

9 :: How can we load multiple tables in to Dataset?
DataSet ds=new DataSet();

SqlDataAdapter dap=new SqlDataAdapter(Select * from <tablename>,<connection1>);

dap.Fill(ds,"TableOne");

SqlDataAdapter dap1=new SqlDataAdapter(Select * from <tablename>,<connection1>);

dap1.Fill(ds,"tableTwo");

10 :: What is connection String?
connection String - a string which contains address of the database we want to connect to.


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