Excel Prozess schließen (Original von Andy Nikolov)

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//http://dotnet-snippets.de/dns/excel-prozess-schliessen-SID1153.aspx

// use user32.dll
[System.Runtime.InteropServices.DllImport("user32.DLL")]
        public static extern IntPtr GetWindowThreadProcessId(int hWnd, ref IntPtr lpdwProcessID);

        /// <summary>
        /// kills an Excel application
        /// </summary>
        /// <param name="myExcelApp">The application to kill</param>
        public static void killExcelInstanceById(ref Microsoft.Office.Interop.Excel.Application myExcelApp)
        {
            IntPtr processID = new IntPtr() ;
            
            //API Funktion, out val: processId
GetWindowThreadProcessId(myExcelApp.Hwnd, ref processID);

            System.Diagnostics.Process myExcelProcess = System.Diagnostics.Process.GetProcessById(processID.ToInt32());
            
            // kill it!
            myExcelProcess.Kill();
        }