How will I use Tryparse() method in C# to ensure that each piece of the user's entry data is in the correct type and prompt the user to reenter the data when the data is not valid using a while loop? So the Tryparse() method statement should be where there is a WriteLine asking a user to enter data. Thank you.   using static System.Console; using System.Globalization; class GreenvilleRevenue {    static void Main()  {   int numLastYear;      int numThisYear;      double revenue;      int fee = 25;      const int MAX_CONTESTANTS = 30;      string[] names = new string[MAX_CONTESTANTS];      char[] talents = new char[MAX_CONTESTANTS];      char[] talentCodes = { 'S', 'D', 'M', 'O' };      string[] talentCodesStrings = { "Singing", "Dancing", "Musical instrument", "Other" };      int[] counts = { 0, 0, 0, 0 }; ;       numLastYear = GetContestantNumber("last", 0, 30); numThisYear = GetContestantNumber("this", 0, 30); WriteLine("Last year's competition had {0} contestants, and this year's has {1} contestants", numLastYear, numThisYear);  revenue = (numThisYear * fee); WriteLine("Revenue expected this year is {0}", revenue.ToString("C", CultureInfo.GetCultureInfo("en-US"))); DisplayRelationship(numThisYear, numLastYear); GetContestantData(numThisYear, names, talents, talentCodes, talentCodesStrings, counts);  GetLists(numThisYear, talentCodes, talentCodesStrings, names, talents, counts); }   public static int GetContestantNumber(string when, int min, int max) {  int contestants;  string contestantString;  WriteLine("Enter number of contestants {0} year >> ", when);  contestantString = ReadLine();  while(! int.TryParse(contestantString, out contestants)) { WriteLine("Invalid"); WriteLine("Reenter the valid constestants number"); contestantString = ReadLine(); }      return contestants; }   public static void DisplayRelationship( int numThisYear2, int numLastYear2) { if (numThisYear2 > 2 * numLastYear2) WriteLine("The competition is more than twice as big this year!"); else  if (numThisYear2 > numLastYear2)  WriteLine("The competition is bigger than ever!");  else  if (numThisYear2 < numLastYear2)  WriteLine("A tighter race this year! Come out and cast your vote!"); }    public static void GetContestantData(int numThisYear, string[] names, char[] talents, char[] talentCodes, string[] talentCodesStrings, int[] counts) { int x = 0; bool isValid; string talentString; while (x < numThisYear) { Write("Enter contestant name >> "); names[x] = Console.ReadLine();         WriteLine("Talent codes are:"); for (int y = 0; y < talentCodes.Length; ++y) WriteLine(" {0} {1}", talentCodes[y], talentCodesStrings[y]); Write(" Enter talent code >> "); talentString = ReadLine(); while(! char.TryParse(talentString, out talents[x])) { WriteLine(" Invalid format - entry must be a single character"); WriteLine("That is not a valid code"); Write(" Enter talent code >> "); talentString = ReadLine();} talents[x] = GetChar(); isValid = false; while (!isValid) {for (int z = 0; z < talentCodes.Length; ++z) {  if (talents[x] == talentCodes[z]) {isValid = true; ++counts[z]; } } if (!isValid) {WriteLine("{0} is not a valid code", talents[x]); Write(" Enter talent code >> "); talents[x] = GetChar(); } } ++x; }    }      public static void GetLists(int numThisYear, char[] talentCodes, string[] talentCodesStrings, string[] names, char[] talents, int[] counts) {int x; char QUIT = 'Z'; char option; bool isValid; int pos = 0; bool found; WriteLine("\nThe types of talent are:"); for (x = 0; x < counts.Length; ++x) WriteLine("{0, -20} {1, 5}", talentCodesStrings[x], counts[x]); WriteLine("\nEnter a talent type or {0} to quit >> ", QUIT); option = GetChar(); while (option != QUIT) { isValid = false; for (int z = 0; z < talentCodes.Length; ++z) {if (option == talentCodes[z])  { isValid = true;  pos = z; } }  if (!isValid) WriteLine("{0} is not a valid code", option); else { WriteLine("\nContestants with talent {0} are:", talentCodesStrings[pos]); found = false; for (x = 0; x < numThisYear; ++x) { if (talents[x] == option) {WriteLine(names[x]); found = true;} } if (!found) Console.WriteLine("No contestants had talent {0}",     talentCodesStrings[pos]); } WriteLine("\nEnter a talent type or {0} to quit >> ", QUIT);  option = GetChar(); } }                   private static char GetChar()  {char validChar = '0'; bool isValidChar = false; var charInput = string.Empty;               while (!isValidChar) { charInput = Console.ReadLine();  isValidChar = Char.TryParse(charInput, out validChar);                 if (!isValidChar)  { WriteLine("Invalid character - Please try again by entering one character!");                /* WriteLine("Invalid format - entry must be a single character");  } else WriteLine("That is not a valid code");*/ } } return validChar;- } }