How to authenticate web service? When you enter the web service url in browser it should ask username and password. After entering the un&pwd we have to show its methods and service description(wsdl).

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What is multiple interface in c#?

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What is the difference between string keyword and system.string class?

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How do you prevent a class from being inherited?

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What is dynamic in c#?

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What is a concrete class in c#?

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How to make a class non-inheritable other than sealed?

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What is the difference between string and stringbuilder in c#?

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7. C# provides a default constructor for me. I write a constructor that takes a string as a parameter, but want to keep the no parameter one. How many constructors should I write?

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What is visual c# net?

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Is static thread safe?

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Illustrate the differences between the system.array.copyto() and system.array.clone()?

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