Tag: Interview questions

Interview question: What is the purpose of “as” operator in C#?

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“as” operator casts without raising an exception if the cast fails. Example: Object message = new StringReader (“desibanjara”); StringReader newMessage = message as StringReader;   [amazon_link asins=’B019MQLUZG,B079R1JS6K,B079R17XY2,B019MQONW8,B076H5S8S6,B077L4X3PN,B07B6DM75J,B01N3BN5E8,B07B4RZNG2|B00UNEHS44,B01CQOL3F8,B00T7YNWH8,B00T7YOXQC,B01N6BBAK9,B01HE5NDHA,B00SX8GSGG,B01AWLBCIK,B01N0AKAYE’ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’287ddac1-9493-11e8-a97d-331c2e92ac11′]

C# development, Interview questions, IT/Software development

Interview question: What is the purpose of “is” operator in C#?

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“is” operator determines whether an object is of certain type. Ex- If (David is Employee) // checks if David is an object of the Employee class. [amazon_link asins=’007070368X,8120352068,9352136640,8120349172,B015KHN65I,B075GTLVJ2,B06X3WF5FJ|1491988533,1491987650,B016Z18MLG,B000BJVUS6,B00DUQH1IK,B01HLBUXR0,B00SNH9TKO,B01HEZ5H6K,B0107BYPLG,B005ANYMG0′ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’7cb2d21b-9492-11e8-b23a-8b26c4ccd908′]

C# development, Interview questions, IT/Software development

Interview question: What is the difference between GetType() and typeof()?

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typeof() typeof keyword takes the Type itself as an argument and returns the underline Type of the argument. System.Type t1= typeof(Event); // Event is a Type GetType() GetType() will return the given variable base data type. It can only be invoked on the instance of the type. Event event= new Event(); System.Type t2= event.GetType(); // event…

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Interview question: What is the difference between dynamic type variables and object type variables?

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Dynamic types are similar to object types except that type checking for object type variables takes place at compile time, whereas for the dynamic variables type checking take place at run time. [amazon_link asins=’9351190900,1787287041,9386873583,9351343189,8120349172,007070368X,8120352068,9352136640,B016Z18MLG|1840787198,B016Z18MLG,1491988533,1491987650,1119428114,1484230175,1119449278,1119458684,0985580135′ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’23be5044-948b-11e8-b877-0dfd42244dbc’]  

C# development, Interview questions, IT/Software development

Interview question: What are dynamic type variables in C#?

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You can store any type of value in the dynamic type variable. Type checking for these types of variables takes place at runtime. Syntax: dynamic <variable_name> = value; Example: dynamic d = 20; [amazon_link asins=’9351190900,1787287041,9386873583,007070368X,8120349172,8120352068,9352136640|1840787198,1491987650,1491988533,0985580135,1509306986,1119458684,1119428114,1484230175′ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’ffa1faf1-93fb-11e8-a5ca-59726084cb0d’]

C# development, Interview questions, IT/Software development

Interview question: What is boxing and Unboxing in C#?

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Boxing: is the process of converting from VALUE type to REFERENCE type. Ex: converting from int to object Unboxing: is the process of converting from REFERENCE type to VALUE type. Ex: converting from object to int [amazon_link asins=’9351190900,1787287041,007070368X,8120352068,9352136640,8120349172,9386873583,9351343189,B016Z18MLG|1840787198,B016Z18MLG,0985580135,1119458684,1484230175,1119428114,1491987650,1491988533,1119449278′ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’c651b5ad-93d9-11e8-b332-e523a69d9d98′]

C# development, Interview questions, IT/Software development

Interview question: Which class act as a base class for all the data types in .net?

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System.Object is the base class for all data types in C# Common Type System (CTS). Object is an alias for System.Object class. The object types can be assigned values of any other types, value types, reference types. Predefined or user-defined types. However, before assigning values, it needs type conversion.   [amazon_link asins=’9351190900,1787287041,9386873583,007070368X,8120349172,9351343189,8120352068,9352136640,B016Z18MLG|1840787198,B016Z18MLG,0985580135,1119458684,1484230175,1119428114,1491987650,1491988533,1119449278′ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’…

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Interview question: Can we assign null value into value type variable?

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No we cannot assign null value into value type variable, but we can assign null values into reference type variable.   [amazon_link asins=’9351190900,8120352068,9352136640,007070368X,B078NRPJT6,B0072T3X38,B011V10Z2O,B06X6JTX4B,B01FFQ1FS4,B0719KCBZT|1840787198,1491988533,1491987650,1484230175,B00IAGBTZQ,B00UNEHS44,B01AWLB1PY,B01N0AKAYE,B00SX8GSGG’ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’20ae0718-93c0-11e8-baef-7374f0f50c99′]

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Interview question: What is the difference between ref and out parameters?

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Reference parameter (Ref parameter) copies the reference to the memory location of an argument into the formal parameter. This means that changes made to the parameter affect the argument. Output parameters are similar to reference parameters, except that they transfer data out of the method rather than into it. [amazon_link asins=’9351190900,9352136640,8120349172,007070368X,B076HG97KS,B019MQLUZG,B079R17XY2,B01N3BN5E8|1840787198,1484230175,1491987650,1491988533,B00IAGBTZQ,B01AWLB1PY,B00UNEHS44,B01N0AKAYE’ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’68ddef8e-93bc-11e8-92e5-1f0ecc2f4de5′]

C# development, Interview questions, IT/Software development

Interview question: Can you return multiple values from a function in C#?

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Yes, by using output parameters, we can return multiple values from a function in C#. A return statement can be used for returning only one value from a function. However, using output parameters, you can return two values from a function.   [amazon_link asins=’007070368X,9352136640,1787287041,8120349172,B078NRPJT6,B011V10Z2O,B011V135LM,B0719KCBZT|1840787198,1491987650,1491988533,1119449278,B01AC6P7OU,B00RCIU1S4,B0036DUP1M,B06Y1V7SZC’ template=’ProductGrid’ store=’desibanjara22-21|desibanjaraco-21′ marketplace=’IN|UK’ link_id=’085f5b85-93b9-11e8-9df3-cd704103ff25′]

C# development, Interview questions, IT/Software development