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ADO.NET INTERVIEW QUESTION & ANSWERS

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86. What keyword is used to accept a variable number of parameter in a method?
  params keyword is used as to accept variable number of parameters.
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87. What type of data model does an OleDbCommand object fill?
  An ADODataReader object.
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88. Does an OleDbCommand object need to be closed?
  No, only the OleDbDataReader and OleDbConnection object need to be closed explicitly.
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89. What are the major components of data provider?
 
  • The Connection object which provides a connection to the database
  • The Command object which is used to execute a command
  • The DataReader object which provides a forward-only, read only, connected recordset
  • The DataAdapter object which populates a disconnected DataSet with data and performs update
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90. What are the different methods available under sqlcommand class to access the data?
 
  • ExecuteReader – Used where one or more records are returned – SELECT Query.
  • ExecuteNonQuery – Used where it affects a state of the table and no data is being queried – INSERT, UPDATE, DELETE, CREATE and SET queries.
  • ExecuteScalar – Used where it returns a single record(a single value normally) – SQL Functions like MIN(), NAX()
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