I need some C# prograaming help

I wrote $3$ files for the original assignment $($Below is the code$)$

PROGRAM.cs

using ConsoleApp$6$;

class Program

$\{$

public static double loanAmount;

public static double years;

public static double interest;

static void Main$($string$[]$args$,$ double loanAmount$)$

$\{$

Console.Write$("$Enter loan amount: $")$;

double loanAmount $=$ Convert.ToDouble$($Console$.$ReadLine$())$;

Console.Write$("$Enter number of years: $")$;

double years $=$ Convert.ToDouble$($Console$.$ReadLine$())$;

Console.Write$("$Enter interest rate $($in decimal form, e$.$g$.,0\mathrm{.}05$ for $5\%)$: $")$;

double interestRate $=$ Convert.ToDouble$($Console$.$ReadLine$())$;

C$1$ loanInfo $=$ new C$1($loanAmount$,$ years, interestRate$)$;

double totalInterests $=$ loanInfo.PayInterests$()$;

Console.WriteLine$($$"Total interest to be paid: $\{$totalInterests:C$\}")$;

string message $=$ loanInfo.iMessage$()$;

Console.WriteLine$($message$)$;

$\}$

private static void CheckLoanAmount$($double loanAmount$)$

$\{$

throw new NotImplementedException$()$;

$\}$

$\}$

IMYInterface.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApp$6$

$\{$

interface IMyInterface

$\{$

string iMessage$()$;

$\}$

$\}$

C$1.$cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApp$6$

$\{$

class C$1$ : IMyInterface

$\{$

private double loanAmount $=0\mathrm{.}0$;

private double years $=0\mathrm{.}0$;

private double interestRate $=0\mathrm{.}0$;

private double interests $=0\mathrm{.}0$;

public C$1($double loanAmount, double years, double interestRate$)$

$\{$

this.loanAmount $=$ loanAmount;

this.years $=$ years;

this.interestRate $=$ interestRate;

$\}$

public double PayInterests$()$

$\{$

interests $=$ loanAmount $*$ interestRate $*$ years;

return interests;

$\}$

public string iMessage$()$

$\{$

return $"$Be Ready!";

$\}$

public double LoanAmount

$\{$

get $\{$ return loanAmount; $\}$

set $\{$ loanAmount $=$ value; $\}$

$\}$

public double Years

$\{$

get $\{$ return years; $\}$

set $\{$ years $=$ value; $\}$

$\}$

public double InterestRate

$\{$

get $\{$ return interestRate; $\}$

set $\{$ interestRate $=$ value; $\}$

$\}$

$\}$

$\}$

Here is the second part that I need help with.

$1.$ Create a class "MyRangeException.cs$"($similar to example code$).(20\%)$

$2.$ In "Program.cs$",$ in main$(),$ Add Exception Handling $(20\%)$

class Program

$\{$

public static double loanAmount;

public static double years;

public static double interest;

static void Main$($string$[]$ args$)$

$\{$

$.....$

$//$for loanAmount

do $\{$

try

$\{$

Console.Write$("$Please enter the loan amount: $$")$;

loanAmount $=$ Convert.ToDouble$($Console$.$ReadLine$())$;

CheckLoanAmount $($loanAmount$)$;

continueLoop $=$ false;

$\}$

catch $($ FormatException formatException $)$

$\{$

Console.WriteLine$("$

$"+$ formatException.Message $)$;

Console.WriteLine$($ "Please enter a double value.

$")$;

$\}//$ end catch

catch $($MyRangeException negativeNumberException $)$

$\{$

Console.WriteLine$("$

$"+$ negativeNumberException.Message $)$;

$//$Console$.$WriteLine$($ "Please enter a non$-$negative value.

$")$;

$\}//$ end catch

$\}$ while $($continueLoop$)$;

$.....$

$//$for years

do $\{$

$\}$while $($ continueLoop $)$;

$.....$

$//$for interest

do $\{$

$\}$while $($ continueLoop $)$;

$\}$

$.....$

$\}$

Requirement $($similar to the example$)$: Add methods to check the value

$=====================$

$-$ loanAmount $(20\%)$

$-$ must be a number, threw FormatException if not

$-$ must be greater than $50000,$ throw Exception if not

$-$ Create a method CheckLoanAmount$($double la$)$

throw new MyRangeException$("$Loan Amount must be $$50,000$ or more."$)$;

$-$public static void CheckLoanAmount$($double la$)$

$\{$

if $($la $<50000)$

throw new MyRangeException$($ "Loan Amount must be $$50,000$ or more."$)$;

$\}$

$-$ loanInterest $(20\%)$

$-$ must be a number, threw FormatException if not

$-$ must be greater than $1\%,$ throw Exception if not

$-$ Create a method CheckLoanInterest