using System;

using System.Windows.Forms;

using Excel = Microsoft.Office.Interop.Excel; 



namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            Excel.Application xlApp ;

            Excel.Workbook xlWorkBook ;

            Excel.Worksheet xlWorkSheet ;

            object misValue = System.Reflection.Missing.Value;



            xlApp = new Excel.ApplicationClass();

            xlWorkBook = xlApp.Workbooks.Add(misValue);

            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);



            xlWorkSheet.SetBackgroundPicture("C:\\csharp-xl-picture.JPG"); 



            //add some text 

            xlWorkSheet.Cells[1, 1] = "http://csharp.net-informations.com";

            xlWorkSheet.Cells[2, 1] = "Adding background in Excel File";





            xlWorkBook.SaveAs("csharp.net-informations.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);

            xlWorkBook.Close(true, misValue, misValue);

            xlApp.Quit();



            releaseObject(xlApp);

            releaseObject(xlWorkBook);

            releaseObject(xlWorkSheet);



            MessageBox.Show ("File created !");

        }



        private void releaseObject(object obj)

        {

            try

            {

                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);

                obj = null;

            }

            catch (Exception ex)

            {

                obj = null;

                MessageBox.Show("Unable to release the Object " + ex.ToString());

            }

            finally

            {

                GC.Collect();

            }

        } 



    }

}