عدم نمایش اطلاعات در دیتاگرید

با سلام با این کد اکسل رو فراخوانی میکنم ولی نمایش داده نمیشه و اخطار هم نداره

   try            {

                OpenFileDialog openfile = new OpenFileDialog();

                openfile.DefaultExt = ".xlsx";

                openfile.Filter = "(.xlsx)|*.xlsx";  

                var browsefile = openfile.ShowDialog();

                if (browsefile == true)

                {

                    textBox1.Text = openfile.FileName;

                    Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();

                    Microsoft.Office.Interop.Excel.Workbook excelBook = excelApp.Workbooks.Open(textBox1.Text.ToString(), 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindow  s, "\t", false, false, 0, true, 1, 0);

                    Microsoft.Office.Interop.Excel.Worksheet excelSheet = (Microsoft.Office.Interop.Excel.Worksheet)excelBoo  k.Worksheets.get_Item(1); ;

                    Microsoft.Office.Interop.Excel.Range excelRange = excelSheet.UsedRange;





                    string strCellData = "";

                    double douCellData;

                    int rowCnt = 0;

                    int colCnt = 0;





                    DataTable dt = new DataTable();

                    for (colCnt = 1; colCnt <= excelRange.Columns.Count; colCnt++)

                    {

                        string strColumn = "";

                        strColumn = (string)(excelRange.Cells[1, colCnt] as Microsoft.Office.Interop.Excel.Range).Value2;

                        dt.Columns.Add(strColumn, typeof(string));

                    }









                    for (rowCnt = 2; rowCnt <= excelRange.Rows.Count; rowCnt++)

                    {

                        string strData = "";

                        for (colCnt = 1; colCnt <= excelRange.Columns.Count; colCnt++)

                        {

                            try

                            {

                                strCellData = (string)(excelRange.Cells[rowCnt, colCnt] as Microsoft.Office.Interop.Excel.Range).Value2;

                                strData += strCellData + "|";

                            }

                            catch (Exception)

                            {

                                douCellData = (excelRange.Cells[rowCnt, colCnt] as Microsoft.Office.Interop.Excel.Range).Value2;

                                strData += douCellData.ToString() + "|";

                            }

                        }

                        strData = strData.Remove(strData.Length - 1, 1);

                        dt.Rows.Add(strData.Split('|'));

                    }





                    dataGrid1.ItemsSource = dt.DefaultView;





                    excelBook.Close(true, null, null);

                    excelApp.Quit();





                }

            }

            catch

            {

            }