Code Inspection: Use string interpolation expression

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This inspection suggests that you use a C# 6.0 feature.

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To set the C# version for all projects in your solution, specify it in a Directory.Build.props file in your solution directory as described here.

Starting from C# 6.0, you can use string interpolation expressions instead of calling String.Format(). If you pass a lot of arguments to the String.Format() method, the string becomes difficult to understand. Compared to String.Format(), interpolated string expressions allow inserting variables directly in the string.

var greeting = string.Format("Hi {0}! How do you feel at {1}?", name, location);

var greeting = $"Hi {name}! How do you feel at {location}?";