Reading an Excel file in C#

Hello experts:
I'm trying to load the load test.xls contents thru c# code so that I can update some data base fields:
My code is below:

public class BankParserClass

Excel.Application excelApp = new Excel.ApplicationClass();

Excel.Workbook newWorkbook = excelApp.Workbooks.Add(XlWBATemplate.xlWBATWorksheet);
( this line of code gets an error    here on excelApp : denotes a fileld where a class is expected)                                                  

string workbookPath = "c:/test.xls";
Excel.Workbook excelWorkbook = excelApp.Workbooks.Open(workbookPath,
      0, false, 5, "", "", false, Excel.XlPlatform.xlWindows, "",
      true, false, 0, true, false, false);
Excel.Sheets excelSheets = excelWorkbook.Worksheets;
      string currentSheet = "Sheet1";
Excel.Worksheet excelWorksheet = (Excel.Worksheet)excelSheets.get_Item(currentSheet);
Excel.Range excelCell =(Excel.Range)excelWorksheet.get_Range("A1", "A1");

I got other errors but I think they are related to the 1st error above.  

Thanks
lancerxeAsked:
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YurichCommented:
have you added a reference to your application? I mean "Microsoft Excell 9.0 (or 10.0) Object Library"?

regs,
yurich
alpesh_mcaCommented:
Hi  lancerxe,

This is application is kind of test application which tells how to use Microsoft Excel 10.0 Object Library, by using this library, how to load/read the excel contents.

Note: Here, I have created test.xls file which will be copied to c:\ before run the application.

Application developed using sample console application under VC# projects.

Steps:

 1. Include the following reference into the project :

  Microsoft Excel 10.0 Object Library

  Microsoft Office 10.0 Object Library

 

2. Include the name space i.e. using Excel.

3. Creating the ExcelApplicationClass,WorkBook and Range.

Find the complete code below:

using System;
using Excel;
namespace TestExcel
{
 /// <summary>
 /// Summary description for ExcelApplication.
 /// </summary>
 class ExcelApplication
 {
      /// <summary>
  /// The main entry point for the application.
  /// </summary>
      [STAThread]
      static void Main(string[] args)
      {
         
         string Path = @"c:\test.xls";
         // initialize the Excel Application class
         Excel.ApplicationClass app = new ApplicationClass();
         // create the workbook object by opening the excel file.
         Excel.Workbook workBook = app.Workbooks.Open(Path,
                                                      0,
                                                      true,
                                                      5,
                                                      "",
                                                      "",
                                                      true,
                                                      Excel.XlPlatform.xlWindows,
                                                      "\t",
                                                      false,
                                                      false,
                                                      0,
                                                      true,
                                                      1,
                                                      0);
         // get the active worksheet using sheet name or active sheet
         Excel.Worksheet workSheet = (Excel.Worksheet)workBook.ActiveSheet;
         int index = 0;
         // This row,column index should be changed as per your need.
         // i.e. which cell in the excel you are interesting to read.
         object rowIndex = 2;
         object colIndex1 = 1;
         object colIndex2 = 2;
         try
         {
            while ( ((Excel.Range)workSheet.Cells[rowIndex,colIndex1]).Value2 != null )
            {
               rowIndex = 2+index;
               string firstName = ((Excel.Range)workSheet.Cells[rowIndex,colIndex1]).Value2.ToString();
               string lastName = ((Excel.Range)workSheet.Cells[rowIndex,colIndex2]).Value2.ToString();
               Console.WriteLine("Name : {0},{1} ",firstName,lastName);
               index++;
            }
         }
         catch(Exception ex)
         {
            app.Quit();
            Console.WriteLine(ex.Message);
         }
      }
     
 }
}

I hope this is what you are looking for.
All the very best.
Thanks,
Alpesh Patel.


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HarryNSCommented:
There is one easy of reading excel file from .Net application.

string strFilePath = "C:\A.xls";
string excelConnectionString = "Dsn=Excel Files;dbq=" + strFilePath + ";defaultdir=" + ";driverid=790;maxbuffersize=2048;pagetimeout=5";
                    //Load Open detals
                    using (OdbcConnection connection = new OdbcConnection(excelConnectionString))
                    {
                        try
                        {
                            connection.Open();

                            OdbcCommand command = new OdbcCommand("Select [ID], [Status],[Created] FROM [Open$]", connection);
                            OdbcDataAdapter da = new OdbcDataAdapter(command);
                            da.Fill(dsSummary, "Open");

                            connection.Close();
                        }
                        catch
                        {
                            connection.Close();
                        }
RomasaCommented:
Calling Com services is very slow process becaue it is remote procedure call .
 opening OBdc connection or OLedb  is an effeicent way you can easily filter data as want but in
excel object it iterate row by row and cause increase in condition or check you apply for filter.
In calling Excel object cause some problem while closing its object , if program breaks without closing excel
object it remain open until you by force kill them from task manager.
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