Code review is an integral part of the software development lifecycle, ensuring code quality, identifying bugs, and promoting collaboration among team members. In .NET C# development, following best practices during code reviews is essential to maintain a high standard of code. Let's delve into some of the best practices along with examples in C#/.NET.

1. Keep Reviews Small and Focused
It's advisable to keep code reviews small and focused on specific changes. Large reviews can be overwhelming and lead to missing crucial issues. Aim for smaller, manageable chunks of code changes. For example:

// Bad practice: Large code block for review
public void ComplexMethod()
{
    // Complex logic here...
    // Several hundred lines of code...
    // Difficult to review all at once.
}

Instead, break down complex methods into smaller, more manageable ones:

// Good practice: Breaking down complex logic into smaller methods
public void ComplexMethod()
{
    StepOne();
    StepTwo();
    StepThree();
}

private void StepOne()
{
    // Code for step one
}

// Define StepTwo() and StepThree() similarly

2. Ensure Code Readability and Consistency
Readable code is crucial for maintainability. Follow consistent naming conventions, formatting, and adhere to coding standards. For instance:

// Inconsistent naming and formatting
public void Processdata(int input)
{
    var Result = input * 2;
    Console.WriteLine("Result is: " + Result);
}

Instead, use consistent naming conventions and formatting:

// Consistent naming and formatting
public void ProcessData(int input)
{
    var result = input * 2;
    Console.WriteLine($"Result is: {result}");
}

3. Test Code Functionality and Edge Cases
Reviewers should ensure that the code functions as expected and covers edge cases. Consider scenarios like boundary conditions, null checks, and error handling:

// Inadequate error handling
public void Divide(int numerator, int denominator)
{
    var result = numerator / denominator;
    Console.WriteLine($"Result is: {result}");
}

Improve error handling and edge case coverage:

// Better error handling and edge case coverage
public void Divide(int numerator, int denominator)
{
    if (denominator != 0)
    {
        var result = numerator / denominator;
        Console.WriteLine($"Result is: {result}");
    }
    else
    {
        Console.WriteLine("Cannot divide by zero.");
        // Handle the error gracefully
    }
}

4. Encourage Constructive Feedback and Discussions
Code reviews should foster a collaborative environment where team members can give and receive constructive feedback. Encourage open discussions on improvements without criticism:

// Discussing improvements
// Reviewer: "Consider using a switch statement for better readability."
// Author: "That's a good point. I'll refactor the code accordingly."

Conclusion
Code reviews play a pivotal role in enhancing code quality, fostering collaboration, and reducing bugs in C#/.NET development. By following these best practices and incorporating them into your development workflow, teams can ensure the delivery of robust, high-quality software.

Remember, code reviews are not just about finding bugs but also about improving overall code quality and fostering a culture of collaboration and learning within the development team.