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Please use C#   using System; namespace UsernameProcessor.Question; public sealed class UsernameProcessorService { /// /// Requirements: /// - A valid username shall be at least 4 characters. /// - A valid username shall contain only letters, numbers and an optional underscore. /// - A valid username shall start with a letter, and shall not end with an underscore. /// ///The username to be validated ///Whether or not the username is valid per the above requirements. publicstaticboolIsValidUsername(stringusername) { thrownewNotImplementedException("TODO: please validate our usernames!!!"); } /// /// Feel free to use the below main function to test and develop accordingly! /// publicstaticvoidMain(string[]args) { Console.WriteLine(IsValidUsername("Valid_Username")); Console.WriteLine(IsValidUsername("Invalid Username")); } }

Please use C#   using System; namespace UsernameProcessor.Question; public sealed class UsernameProcessorService { /// /// Requirements: /// - A valid username shall be at least 4 characters. /// - A valid username shall contain only letters, numbers and an optional underscore. /// - A valid username shall start with a letter, and shall not end with an underscore. /// ///The username to be validated ///Whether or not the username is valid per the above requirements. publicstaticboolIsValidUsername(stringusername) { thrownewNotImplementedException("TODO: please validate our usernames!!!"); } /// /// Feel free to use the below main function to test and develop accordingly! /// publicstaticvoidMain(string[]args) { Console.WriteLine(IsValidUsername("Valid_Username")); Console.WriteLine(IsValidUsername("Invalid Username")); } }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Please use C#
 
using System;

namespace UsernameProcessor.Question;

public sealed class UsernameProcessorService
{

///<summary>
/// Requirements:
/// - A valid username shall be at least 4 characters.
/// - A valid username shall contain only letters, numbers and an optional underscore.
/// - A valid username shall start with a letter, and shall not end with an underscore.
///</summary>
///<paramname="username">The username to be validated</param>
///<returns>Whether or not the username is valid per the above requirements.</returns>
publicstaticboolIsValidUsername(stringusername)
{
thrownewNotImplementedException("TODO: please validate our usernames!!!");
}

///<summary>
/// Feel free to use the below main function to test and develop accordingly!
///</summary>
publicstaticvoidMain(string[]args)
{
Console.WriteLine(IsValidUsername("Valid_Username"));
Console.WriteLine(IsValidUsername("Invalid Username"));
}
}
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