Constant interpolated strings in c#

In C#, you can use constant interpolated strings to create a string that contains constant values. Constant interpolated strings are similar to regular interpolated strings, but they are marked with the const keyword and can only contain constant values.

Here's an example of how to use a constant interpolated string in C#:

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const int num = 5;
const string message = $"The value of num is {num}";

Console.WriteLine(message);

This will output the string "The value of num is 5" to the console.

Note that you can only use constant values in a constant interpolated string. If you try to use a non-constant value, you will get a compile-time error.

int nonConstant = 10;
const string message = $"The value of nonConstant is {nonConstant}"; // Error: nonConstant is not a constant

Constant interpolated strings can be useful when you want to create a string that contains constant values and you want to ensure that the string cannot be modified at runtime. They can also improve performance, as the compiler can optimize the string at compile time.