Problem while Reading excel(.Xls) file

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C#

For Reading excel file i use this code.i have abc.xls file
when i import abc.xls file excelSheet.get_Range("A1", "A1").Text read junck value



i copy all content of abc.xls to new file pqr.xls it show correct in
excelSheet.get_Range("A1", "A1").Text
Whats the probelm i am not able to figure out issue.any idea?

Microsoft.Office.Interop.Excel.Application excelApp = null;
            Microsoft.Office.Interop.Excel.Workbook excelWrkBk = null;
            Microsoft.Office.Interop.Excel.Worksheet excelSheet = null;
            Microsoft.Office.Interop.Excel.Range excelRange = null;
            try
            {
                excelApp = new Microsoft.Office.Interop.Excel.Application();

                excelWrkBk = excelApp.Workbooks.Open(SourceFileName,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
Type.Missing, Type.Missing, Type.Missing, true);



                excelSheet = (Microsoft.Office.Interop.Excel.Worksheet)excelWrkBk.Sheets[1];

                while (true)
                {


                    if (!Convert.ToString(excelSheet.get_Range("A1", "A1").Text).Contains("Sl No."))
                    {
                        excelRange = (Microsoft.Office.Interop.Excel.Range)excelSheet.get_Range("A1", "AG1");
                        excelRange.Delete(Microsoft.Office.Interop.Excel.XlDeleteShiftDirection.xlShiftUp);
                        
                    }
                    else
                    {
                        break;
                    }
                }
                excelWrkBk.Save();
                excelWrkBk.Close(true, true, Type.Missing);

               
               // excelWrkBk.Close(true, SourceFileName, false);
                return GetReadOtherExcelFile(SourceFileName);
            }
            catch
            {
                throw;
            }
            finally
            {
                excelRange = null;
                excelSheet = null;
                excelWrkBk = null;
                if (excelApp != null) excelApp.Quit();
                excelApp = null;
            }