// Solution Code

namespace PDFProcessor

{

    using Emergency_Equipment;

    using Tabula;

    using System;

​

    public class PDFConverter

    {

        /// <summary>

        /// Converts a Tabula.PageArea object to an Emergency_Equipment.PageArea object and extracts text from the corresponding area in the PDF.

        /// </summary>

        /// <param name="tabulaArea">The Tabula.PageArea object defining the region of interest.</param>

        /// <returns>The extracted text from the specified area.</returns>

        /// <exception cref="ArgumentNullException">Thrown when the input tabulaArea is null.</exception>

        /// <exception cref="ArgumentException">Thrown when the calculated width or height is negative.</exception>

        public static string ConvertAndExtract(Tabula.PageArea tabulaArea)

        {

            if (tabulaArea == null)

            {

                throw new ArgumentNullException(nameof(tabulaArea), "The input Tabula PageArea cannot be null.");

            }

​

            int width = tabulaArea.Right - tabulaArea.Left;

            int height = tabulaArea.Bottom - tabulaArea.Top;

​

            if (width < 0)

            {

                throw new ArgumentException("The calculated width is negative. Invalid Tabula PageArea dimensions.");

            }

​

            if (height < 0)

            {

                throw new ArgumentException("The calculated height is negative. Invalid Tabula PageArea dimensions.");

            }

​

            var emergencyArea = new Emergency_Equipment.PageArea

            {

                X = tabulaArea.Left,

                Y = tabulaArea.Top,

                Width = width,

                Height = height

            };

​

            var extractor = new Emergency_Equipment.PDFExtractor();

            return extractor.ExtractText(emergencyArea);

        }

    }

​

    // Example Program

    public class Program

    {

        public static void Main(string[] args)

        {

            try

            {

                var tabulaArea = new Tabula.PageArea

                {

                    Left = 10,

                    Top = 20,

                    Right = 100,

                    Bottom = 200

                };

​

                string extractedText = PDFConverter.ConvertAndExtract(tabulaArea);

                Console.WriteLine($"Extracted Text: {extractedText}");

            }

            catch (ArgumentNullException ex)

            {

                Console.WriteLine($"Error: {ex.Message}");

            }

            catch (ArgumentException ex)

            {

                Console.WriteLine($"Error: {ex.Message}");

            }

            catch (Exception ex)

            {

                Console.WriteLine($"An unexpected error occurred: {ex.Message}");

            }

        }

    }

}

​

namespace Emergency_Equipment

{

    public class PageArea

    {

        public int X { get; set; }

        public int Y { get; set; }

        public int Width { get; set; }

        public int Height { get; set; }

    }

​

    public class PDFExtractor

    {

        public string ExtractText(PageArea area)

        {

            // Implementation using Emergency_Equipment library to extract text

            // ...

            return "extracted text";

        }

    }

}

​

namespace Tabula

{

    public class PageArea

    {

        public int Left { get; set; }

        public int Top { get; set; }

        public int Right { get; set; }

        public int Bottom { get; set; }

    }

}