C#

string str = string.Empty;
               while (str.Length <= 5)
               {
                   char c = Console.ReadKey(true).KeyChar;
                   if (c == '\r')
                   {
                       //user pressed enter
                       break;
                   }
                   if (c == '\b')
                   {
                       //User pressed backspace
                       if (str != string.Empty)
                       {
                           str = str.Substring(0, str.Length - 1);
                           Console.Write("\b \b");
                       }
                   }
                   int enteredValue;
                   if(Int32.TryParse(c.ToString(), out enteredValue))
                   {
                       Console.Write(c);
                       str += c;
                   }
               }
               Console.WriteLine();
               Console.WriteLine("You entered " + str);
               Console.ReadLine();

bool MultiplyFromConsole(){
 int number1, number2;
 string line1, line2;

 Console.Write("Please enter a number: ");
 line1 = Console.ReadLine();

 Console.Write("Please enter a number: ");
 line2 = Console.ReadLine();

 if(!(int.TryParse(line1, out number1) && int.TryParse(line2, out number2))
  return false;
 
 Console.WriteLine("Multiplication: " + (number1 * number2));
 return true;
}

Running a transacted installation.

Beginning the Install phase of the installation.
See the contents of the log file for the <Path to folder for Service.exe> \Service.exe assembly's progress.
The file is located at <Path to folder for Service.exe >\QuickLoop.InstallLog.

An exception occurred during the Install phase.
System.Security.SecurityException: The source was not found, but some or all event logs could not be searched.  Inaccessible logs: Security.

The Rollback phase of the installation is beginning.
See the contents of the log file for the <Path to folder for Service.exe> \Service.exe assembly's progress.
The file is located at <Path to folder for Service.exe >\QuickLoop.InstallLog.

The Rollback phase completed successfully.

The transacted install has completed.