Workaround for Excel Automation Issues

ExcelWorkaround.cs

OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "Excel Files|*.xls*";
DialogResult result = openFileDialog1.ShowDialog(); 
if (result == DialogResult.OK) 
{
	new Thread(() =>
	{
		Excel.Application excelApp = null;
		Excel.Workbook excelWorkbook = null;

		this.Invoke(new Action(() =>
		{
			try
			{
				excelApp = (Microsoft.Office.Interop.Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
			}
			catch
			{
				excelApp = new Excel.Application();
			}

			string workbookPath = openFileDialog1.FileName;
			excelWorkbook = excelApp.Workbooks.Open(workbookPath);

			excelApp.Visible = true;

		}));

		Marshal.ReleaseComObject(excelWorkbook);
		Marshal.ReleaseComObject(excelApp);
		excelApp = null;
		excelWorkbook = null;
		openFileDialog1 = null;
		GC.Collect();
		GC.Collect();
		GC.WaitForPendingFinalizers();
		GC.WaitForFullGCComplete();
	}).Start();
}