162 questions for C# Developer jobs

Learn C# (Sharp) Programming Language by Interview Questions and Answers

1 What's C#?
2 Is it possible to inline assembly or IL in C# code? 
3 Is it possible to have different access modifiers on the get/set methods of a property in C#?
4 Is it possible to have a static indexer in C#?
5 If I return out of a try/finally in C#, does the code in the finally-clause run? 
6 I was trying to use an out int parameter in one of my functions. How should I declare the variable that I am passing to it? 
7 How does one compare strings in C#? 
8 How do you specify a custom attribute for the entire assembly (rather than for a class)? 
9 How do you mark a method obsolete? 
10 How do you implement thread synchronization (Object.Wait, Notify,and CriticalSection) in C#? 
11 How do you directly call a native function exported from a DLL? 
12 How do I simulate optional parameters to COM calls?
13 The C# keyword .int. maps to which .NET type? 
14 Which of these string definitions will prevent escaping on backslashes in C#? 
15 Which of these statements correctly declares a two-dimensional array in C#? 
16 If a method is marked as protected internal who can access it? 
17 What is boxing in C#? 
18 What compiler switch creates an xml file from the xml comments in the files in an assembly? 
19 What is a satellite assembly in C#? 
20 What is a delegate in C#? 
21 How does assembly versioning in .NET prevent DLL Hell? 
22 Which .Gang of Four. design pattern is shown below? 
23 In the NUnit test framework, which attribute must adorn a test class in order for it to be picked up by the NUnit GUI? 
24 Which of the following operations can you NOT perform on an ADO.NET DataSet? 
25 In Object Oriented Programming, how would you describe encapsulation in C#? 
26 What do you know about .NET assemblies?
27 What is the difference between private and shared assembly?
28 What is a strong name in C#?
29 How can you tell the application to look for assemblies at the locations other than its own install?
30 How can you debug failed assembly binds?
31 Where are shared assemblies stored?
32 How can you create a strong name for a .NET assembly?
33 Where is global assembly cache located on the system?
34 Can you have two files with the same file name in GAC?
35 So lets say I have an application that uses MyApp.dll assembly ...
36 What is delay signing?
37 Is there an equivalent of exit() for quitting a C# .NET application?
38 Can you prevent your class from being inherited and becoming a base class for some other classes?
39 If a base class has a bunch of overloaded constructors ...
40 I was trying to use an "out int" parameter in one of my functions. How should I declare the variable that I am passing to it?
41 How do I make a DLL in C#?
42 Will finally block get executed if the exception had not occurred?
43 What is the C# equivalent of C++ catch (), which was a catch-all statement for any possible exception? Does C# support try-catch-finally blocks?
44 Is there regular expression (regex) support available to C# developers?
45 Is there a way to force garbage collection?
46 Does C# support properties of array types?
47 What connections does Microsoft SQL Server support?
48 What is a satellite assembly?
49 How is method overriding different from overloading?
50 When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?
51 Why would you use untrusted verification?
52 What is the implicit name of the parameter that gets passed into the class set method?
53 How do I register my code for use by classic COM clients?
54 How do I do implement a trace and assert?
55 How do I create a multilanguage, multifile assembly?
56 C# provides a default constructor for me. I write a constructor that takes a string as a parameter ...
57 What is the equivalent to regsvr32 and regsvr32 /u a file in .NET development?
58 Explain ACID rule of thumb for transactions.
59 Where is the output of TextWriterTraceListener redirected?
60 How do I create a multilanguage, single-file assembly?
61 Why cannot you specify the accessibility modifier for methods inside the interface?
62 Is it possible to restrict the scope of a field/method of a class to the classes in the same namespace?
63 Why do I get a syntax error when trying to declare a variable called checked?
64 Why are there five tracing levels in System.Diagnostics.TraceSwitcher?
65 What is the syntax for calling an overloaded constructor within a constructor (this() and constructorname() does not compile)?
66 Why do I get a "CS5001: does not have an entry point defined" error when compiling?
67 What does the keyword virtual mean in the method definition?
68 What optimizations does the C# compiler perform when you use the /optimize+ compiler option?
69 How can I create a process that is running a supplied native executable (e.g., cmd.exe)?
70 What is the difference between the System.Array.CopyTo() and System.Array.Clone()?
71 How do I declare inout arguments in C#?
72 Is there a way of specifying which block or loop to break out of when working with nested loops?
73 What is the difference between const and static read-only?
74 What does the parameter Initial Catalog define inside Connection String?
75 What is the difference between System.String and System.StringBuilder classes?
76 What is the top .NET class that everything is derived from?
77 Can you allow class to be inherited, but prevent the method from being over-ridden?
78 Can you change the value of a variable while debugging a C# application?
79 Are private class-level variables inherited?
80 Can you inherit multiple interfaces?
81 From a versioning perspective, what are the drawbacks of extending an interface as opposed to extending a class?
82 Which one is trusted and which one is untrusted?
83 What namespaces are necessary to create a localized application?
84 Does Console.WriteLine() stop printing when it reaches a NULL character within a string?
85 What is the advantage of using System.Text.StringBuilder over System.String?
86 What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET?
87 Why do I get a security exception when I try to run my C# app?
88 Is there any sample C# code for simple threading?
89 What is the difference between // comments, /* */ comments and /// comments?
90 What is the difference between and XML documentation tag?
91 Explain the three services model (three-tier application). Presentation (UI), business (logic and underlying code) and data (from storage or other sources).
92 How do you inherit from a class in C#?
93 How do I port "synchronized" functions from Visual J++ to C#?
94 Can I define a type that is an alias of another type (like typedef in C++)?
95 Is it possible to have different access modifiers on the get/set methods of a property?
96 Does C# support #define for defining global constants?
97 Does C# support templates?
98 Does C# support parameterized properties?
99 Does C# support C type macros?
100 Can you store multiple data types in System.Array?
101 Can you declare the override method static while the original method is non-static?
102 Does C# support multiple inheritance?
103 Can multiple catch blocks be executed?
104 Can you override private virtual methods?
105 What is a pre-requisite for connection pooling?
106 What is the data provider name to connect to Access database?
107 Why does my Windows application pop up a console window every time I run it?
108 What is the wildcard character in SQL?
109 What is the role of the DataReader class in ADO.NET connections?
110 What does the This window show in the debugger?
111 Describe the accessibility modifier protected internal?
112 What is an interface class in C#?
113 What is a multicast delegate in C#?
114 What does assert() do in C#?
115 How do I get deterministic finalization in C#?
116 How can I get around scope problems in a try/catch?
117 Why do I get an error (CS1006) when trying to declare a method without specifying a return type?
118 How do I convert a string to an int in C#?
119 How do you directly call a native function exported from a DLL?
120 What is the .NET datatype that allows the retrieval of data by a unique key?
121 How do you specify a custom attribute for the entire assembly (rather than for a class)?
122 What is the difference between a Struct and a Class?
123 What is the implicit name of the parameter that gets passed into the set method/property of a class?
124 What does the keyword virtual declare for a method or property?
125 How is method overriding different from method overloading?
126 Can you declare an override method to be static if the original method is not static?
127 What are the different ways a method can be overloaded?
128 If a base class has a number of overloaded constructors, and an inheriting class has a number of overloaded constructors; can you enforce a call from an inherited constructor to a specific base constructor?
129 What is a C# delegate?
130 What is a multicast C# delegate?
131 How do you generate documentation from the C# file commented properly with a command-line compiler?
132 What debugging tools come with the .NET SDK?
133 What does assert() method do?
134 What is the difference between the Debug class and Trace class?
135 How do you debug an ASP.NET Web application?
136 What are three test cases you should go through in unit testing?
137 Explain ACID rule of thumb for transactions in C#.
138 Between Windows Authentication and SQL Server Authentication, which one is trusted and which one is untrusted?
139 What does the Initial Catalog parameter define in the connection string?
140 What does the Dispose method do with the connection object?
141 How is the DLL Hell problem solved in NET
142 What are the ways to deploy an assembly?
143 What is the smallest unit of execution in .NET?
144 When should you call the garbage collector in .NET?
145 How do you convert a value-type to a reference-type?
146 Difference between directcast and ctype.
147 An example of a ctype and directcast.
148 ctype(123.34,integer) - should it throw an error? Why or why not?
149 directcast(123.34,integer) - should it throw an error? Why or why not?
150 Difference between a sub and a function in C#.
151 Explain manifest & metadata in C#.
152 Difference between imperative and interrogative code.
153 Difference between value and reference type.
154 What are the two kinds of properties.
155 Constructor in C#.
156 Describe ways of cleaning up objects in C#.
157 How can you clean up objects holding resources from within the code?
158 Which controls do not have events?
159 What is the maximum size of the textbox?
160 Which property of the textbox cannot be changed at runtime?
161 Which control cannot be placed in MDI?
162 What is the difference between proc. sent BY VAL and BY SUB?