C# ATLCOM Interop code snipperts - Part 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Launcher
{
    public partial class InteropDemo1 : Form
    {
        #region Form Code
        int _NumbersCount;
        ATLSimpleObjectDemoLib.SomeClassClass _SomeClassObject = null;


        public InteropDemo1()
        {
            InitializeComponent();
            _NumbersCount = 10;
            _SomeClassObject = new ATLSimpleObjectDemoLib.SomeClassClass();
        }

        #endregion Form Code

        #region Single Dimensional Real Array
        private void btnRun_Click(object sender, EventArgs e)
        {
            try
            {
                float[] Numbers = new float[_NumbersCount];

                for (int inx = 0; inx < _NumbersCount; inx++)
                {
                    Numbers[inx] = inx;
                }
                _SomeClassObject.PutRealNumbers(_NumbersCount - 3, ref Numbers[2]);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Launcher", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {

            }
            return;
        }

        private void btnGet_Click(object sender, EventArgs e)
        {

            float[] Numbers = new float[10];

            _SomeClassObject.GetRealNumbers(2, ref Numbers[4]);

            string str = "";
            for (int inx = 0; inx < 2; inx++)
            {
                str += Numbers[4 + inx].ToString() + "\n";
            }
            MessageBox.Show(str);
        }
        #endregion Single Dimensional Real Array

        #region Not Good Interop
        private void btnNotGoodInterop_Click(object sender, EventArgs e)
        {
            float[] Numbers = new float[_NumbersCount];

            for (int inx = 0; inx < _NumbersCount; inx++)
            {
                Numbers[inx] = inx;
            }
            _SomeClassObject.NotGoodInterop(2, ref Numbers[3]);
        }
        #endregion Not Good Interop

        #region Multi Dimensional Real Array
        private void btnPutMultiDimArray_Click(object sender, EventArgs e)
        {
            float[,] TwoDimNumbers = new float[_NumbersCount / 2, _NumbersCount / 3];

            for (int inx = 0; inx < _NumbersCount / 2; inx++)
            {
                for (int jnx = 0; jnx < _NumbersCount / 3; jnx++)
                {
                    TwoDimNumbers[inx, jnx] = inx * 10 + jnx;
                }
            }
            _SomeClassObject.PutMultiDimensionalArray(TwoDimNumbers);
        }

        private void btnGetMultiDimArray_Click(object sender, EventArgs e)
        {
            Array TwoDimNumbers;
            _SomeClassObject.GetMultiDimensionalArray(out TwoDimNumbers);
        }
        #endregion Multi Dimensional Real Array

        #region String Array
        private void btnPutStrings_Click(object sender, EventArgs e)
        {

            string[] Strings = new string[5];

            Strings[0] = "Code Project";
            Strings[1] = "N. Gopi Krishna";
            Strings[2] = "B.Tech (C.S.E)";
            Strings[3] = null;
            Strings[4] = "ngopikrishna81@yahoo.com";
            _SomeClassObject.PutStrings(Strings);
        }

        private void GetStrings_Click(object sender, EventArgs e)
        {
            string[] Strings = null;
            Array StringsArray = null;
            _SomeClassObject.GetStrings(out StringsArray);
            Strings = StringsArray as string[];
        }

        #endregion String Array

        #region Enum And Structure
        private void btnEnumAndStructure_Click(object sender, EventArgs e)
        {
            ATLSimpleObjectDemoLib.SData data = new ATLSimpleObjectDemoLib.SData();


            data.eEnumVal = ATLSimpleObjectDemoLib.MyEnum.Bad;
            data.Id = 0;
            data.Name = "Lee Van Cleef";


            _SomeClassObject.SampleEnumAndStruct(ATLSimpleObjectDemoLib.MyEnum.Bad, data);
        }
        #endregion Enum And Structure

        #region CStyle function
        [DllImport("CStyleDLL.dll")]
        public static unsafe extern void SamplePutFunction(int nArraySize, int* InputArray);

        [DllImport("CStyleDLL.dll")]
        public static unsafe extern void SamplePutFunction2(int nArraySize1, int nArraySize2, int** InputArray);


        [DllImport("CStyleDLL.dll")]
        public static unsafe extern void SampleGetFunction(long* nArraySize, int** InputArray);


        private void btnPutCStyleArray_Click(object sender, EventArgs e)
        {
            int[] IntArray = new int[100];
            unsafe          // <---- In 2008, this requires an explicit compiler option
            {               
                fixed (int* pArray = IntArray)  //  <--- fixes the pointer during GC.
                {
                    SamplePutFunction(IntArray.Length, pArray);
                }
            }
        }

        private void btnPutCStyleArray2_Click(object sender, EventArgs e)
        {
            //int nSize1 = 10,
            //    nSize2 = 20;
            //int[,] IntArray = new int[nSize1,nSize2];

            //unsafe
            //{
            //    fixed (int* ppArray = IntArray)
            //    {
            //        SamplePutFunction2(nSize1,nSize2, ppArray);
            //    }
            //}
        }

        #endregion CStyle function
    }
}