+What is the difference between async and await in .NET? How do they help in improving the performance of an application?
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+What is the difference between ValueType and ReferenceType in .NET?
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+Write a C# method to serialize an object to JSON and deserialize it back.
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+Can you give an example of a time when you had to debug a particularly difficult issue in a .NET application? What was the issue, and how did you resolve it?
