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ADO.NET Interview Questions


ADO.NET Interview Questions

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If we are not returning any records from the database, which method is to be used? 
Latest Answer: ExecuteNonQuery - this method returns no data at all. It is used mainly with Inserts and Updates of tables. ...

Can we do database operations without using any of the ADO.net objects?This was an interview question 
Latest Answer: According to me, in .NET Technology database access is done through ADO.NET.ADO.NET contain the classes to access database. So, in .NET there is no other way to access database other than ADO.NET classes which also contains objects for DAO, RDO. ...

One interview I faced a Q:how can i retrieve two tables of data at a time by using data reader?Data reader read and forward only, how is it possible to get 2 tables of data at a time 
Latest Answer: This is possible to retrieve data from two tables using datareader.SqlDataReader rd=Command.ExecuteReader("SELECT * FROM Employee | Select * From Order");This will fetch the record from two tables Employee and Order ...
Read Answers (14) | Asked by : sudhakar

I am getting InvalidCastException as (Specified cast is not valid) while updating 2nd column in a datagrid? Id,firstname,lastname are the three columns of my datagrid respectively. I wanted to edit the 
Latest Answer:   int varid = (int)DataGrid1.DataKeys[e.Item.ItemIndex];        TextBox lnm = (TextBox)e.Item.Cells[2].Controls[0];        string str = lnm.Text.ToString();        ...

Latest Answer: Table with columns and rows ...
Read Answers (7) | Asked by : Srikanta Nandi

What is Pull Model and Push Model in ADO.Net? What are the situations when we use one over the other?

Which one of the following objects is a high-level abstraction of the Connection and Command objects in ADO.NET?DataReaderDataSetDataTableDataViewDataAdapter
DataAdapter 
Read Answers (2) | Asked by : Pandian S

Latest Answer: To get the data from a database and put it on a data control In ADO they used recordset In ADO.Net they used dataset Record set is a connection oriented architecture whereas dataset supports a connection-less architecture. In ADO using recordset ...
Read Answers (12) | Asked by : Dhaval

How many App Domains an ASP.NET Worker Process creates if suppose 10 different users are logged into the web site

What is the difference between .Net framework and .Net Compact Framework?Is there any diffence between these two
Read Answers (4) | Asked by : Gopal krishna

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