Change the WinSlider constructor to remove the WinExerciseForm parameter and replace it with a callback function that takes an int parameter.

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Change the WinSlider constructor to remove the WinExerciseForm parameter and replace it with a callback function that takes an int parameter and has no return value (void).

Do not define a custom delegate type, but rather use Action<…>. The delegate should be saved to a class field variable and then used in the track bar's Scroll event to pass the track bar value back to the WinExerciseForm instance through the callback function. The constructor call in the WinExerciseForm class will have to be updated to pass the delegate for the update progress bar method.
Since the callback function delegate in the WinSlider's class field is only assigned once and then not changed after that, make the class field read-only

Remove the UpdateProgressBar method and instead define the method as an anonymous function inside the WinSlider constructor call.
Replace statements like
if (object != null)
   object.member…

with a null-conditional operator.

Replace the WinExerciseForm class field m_slider with a private property named Slider. You may use m_slider as the backing variable or you may auto-implement the backing variable. However, all references in the form code to m_slider (outside of the property) should now reference the property Slider instead.

Use extension methods for the int type to provide Square and Cube functions. Then use these methods in your Calculate function to calculate the square and cube values (e.g. num.Square() where num is an int variable). The Square and Cube functions should each return an int value.

For any single-line properties or methods, replace the property/method body with their equivalent expression body definitions.

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