Question: Mocrosoft C# console application. Write an application named TestScores that continuously prompts a user for test scores until the user enters a sentinel value(please us
Mocrosoft C# console application. Write an application named TestScores that continuously prompts a user for test scores until the user enters a sentinel value(please us the value -777). A valid score from 0 to 100. When the user enters a valid score, add it to a total; when the user enters an invalid score, display an error message. Before the program ends, display the number of scores entered and their average.
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