Why are there five tracing levels in System.Diagnostics.TraceSwitcher?
The tracing dumps can be quite verbose. For applications that are
constantly running you run the risk of overloading the machine and the
hard drive. Five levels range from None to Verbose, allowing you to
fine-tune the tracing activities.
Where is the output of TextWriterTraceListener redirected?
To the Console or a text file depending on the parameter passed to the
How do you debug an ASP.NET Web application?
Attach the aspnet_wp.exe process to the DbgClr debugger.
What are three test cases you should go through in unit testing?
1. Positive test cases (correct data, correct output).
2. Negative test cases (broken or missing data, proper handling).
3. Exception test cases (exceptions are thrown and caught properly).
Can you change the value of a variable while debugging a C#
Yes. If you are debugging via Visual Studio.NET, just go to Immediate
What is the role of the DataReader class in ADO.NET connections?
It returns a read-only, forward-only rowset from the data source. A
DataReader provides fast access when a forward-only sequential read is
needed.What are advantages and disadvantages of Microsoft-provided data
provider classes in ADO.NET?
SQLServer.NET data provider is high-speed and robust, but requires SQL
Server license purchased from Microsoft. OLE-DB.NET is universal for
accessing other sources, like Oracle, DB2, Microsoft Access and
Informix. OLE-DB.NET is a .NET layer on top of the OLE layer, so it’s
not as fastest and efficient as SqlServer.NET.
What is the wildcard character in SQL?
Let’s say you want to query database with LIKE for all employees whose
name starts with La. The wildcard character is %, the proper query with
LIKE would involve ‘La%’.
Explain ACID rule of thumb for transactions.
A transaction must be:
1. Atomic - it is one unit of work and does not dependent on previous
and following transactions.
2. Consistent - data is either committed or roll back, no “in-between”
case where something has been updated and something hasn’t.
3. Isolated - no transaction sees the intermediate results of the
4. Durable - the values persist if the data had been committed even if
the system crashes right after.
What connections does Microsoft SQL Server support?
Windows Authentication (via Active Directory) and SQL Server
authentication (via Microsoft SQL Server username and password).
Between Windows Authentication and SQL Server Authentication, which
one is trusted and which one is untrusted?
Windows Authentication is trusted because the username and password are
checked with the Active Directory, the SQL Server authentication is
untrusted, since SQL Server is the only verifier participating in the
What does the Initial Catalog parameter define in the connection
The database name to connect to.
What does the Dispose method do with the connection object?
Deletes it from the memory.
What is a pre-requisite for connection pooling?
Multiple processes must agree that they will share the same connection,
where every parameter is the same, including the security settings. The
connection string must be identical.
How is the DLL Hell problem
solved in .NET?
Assembly versioning allows the application to specify not only the
library it needs to run (which was available under Win32), but also the
version of the assembly.
What are the ways to deploy an assembly?
An MSI installer, a CAB archive, and XCOPY command.
What is a satellite assembly?
When you write a multilingual or multi-cultural application in .NET, and
want to distribute the core application separately from the localized
modules, the localized assemblies that modify the core application are
called satellite assemblies.
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