ADO.NET :: Accessing Data From Excel Workbook And Displaying It In Windows Form?
Feb 7, 2011
I am building an windows application using visual studio 2005. I want to retreive data from excel workbook and i want to display the retreived data in a drop down menu.
I have few question regarding this process.
1. How do we connect to excel using ADODB.Connection.
let me know following code snippet works or not.
Dim cn as ADODB.Connection
Set cn = New ADODB.Connection
With cn
.Provider = "Microsoft.Jet.OLEDB.4.0"
.ConnectionString = "Data Source=C:MyFolderMyWorkbook.xls;" & _
"Extended Properties=Excel 8.0;"
.Open
End With
2:How do we access and manupilate individual column from excel worksheet?
Since i am new to .Net environment i need detailed explanation about whole process.
I have a scenario where I have to read an excel file to dump records in a mysql database. The code generates an exception Sheet1 not found. I have pasted the code below. Please let me know the solution to the exception. I have given the correct read/write/modify settings to my excel file.
if (fileUpload1.PostedFile.FileName.EndsWith(".xls") || fileUpload1.PostedFile.FileName.EndsWith(".XLS")) { string fileName = Server.MapPath(fileUpload1.PostedFile.FileName); string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileName + ";Extended Properties=Excel 8.0"; // Create the connection object OleDbConnection oledbConn = new OleDbConnection(connString); try { // Open connection oledbConn.Open(); // Create OleDbCommand object and select data from worksheet Sheet1 OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]" , oledbConn); // Create new OleDbDataAdapter OleDbDataAdapter oleda = new OleDbDataAdapter(); oleda.SelectCommand = cmd; // Create a DataSet which will hold the data extracted from the worksheet. DataSet ds = new DataSet(); // Fill the DataSet from the data extracted from the worksheet. oleda.Fill(ds, "RestaurantExcelData"); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { Response.Write("Data: " + ds.Tables[0].Rows[i].ItemArray[0].ToString() + ""); } } catch(Exception e1) { } finally { // Close connection oledbConn.Close(); } } else { Response.Write("File Not Excel (xls||XLS)"); }
I have datatable with records and i have existng Excel file in my application temp folder i want to export datatable records in this excel file workbook and i want to convert this excel workbook into byte array and i want to send this byte array in reponse.write to user to give download excel file option
am new to vb.net programming. i am trying to read an existing excel 2007 file from vb.net i used a form with single button and i written code in button click event
Imports Excel = Microsoft.Office.Interop.Excel Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim xlApp As Excel.Application Dim xlWorkBook As Excel.Workbook Dim xlWorkSheet As Excel.Worksheet xlApp = New Excel.ApplicationClass xlWorkBook = xlApp.Workbooks.Open("C:Documents and SettingsUSERDesktopd0805 [code]...
I have a page that will generate upto 10 copies of some web controlls, depending on how many the user wants, but I am not sure on how to access the data the user enters into it. The code I have is:
[Code]....
As you can see I want to access the vale to add to the list but not sure. I tried tbGameNamei.Vaue but VS has a kanipshat about it.
i friends i am having two forms say form a and formb and having two panels in formb and i want to show this panels from forma based on some condition and the code which i am using is
Dim capfrmobj As New CaptureForm capfrmobj.panelvf.Visible = True capfrmobj.pnlc.Visible = False capfrmobj.pnlnc.Visible = False
i have 2 gridview control in my webpage, with two labels..while exporting the webpage , the data are not displaying in ms-excel..but the size of the excel document is showing as 155 bytes, but contents are not visible...what can i do
I have a Transport Detaisl in DB , i want to dispay data on gridview with marquee scrolling up. Cabs are scheduled for drop every hour. So if drop is at 7pm i hav to dispaly on data of that hour from 6:30 to 7:15 later after 7:15 i have to display next hour data ie 8:00 pm drop data. I am able to get scrollin g data on gridview but how to schedlue it to scroll for such timings
I need to develop web application. In my application i have transaction form. Like sales invoice contains 2 tables,header table and detail table. In my web form i should have gridview, in that gridview user should enter data's and save it to the detail table.
I am getting error as sys.webforms.pagerequestmanageparsererrorexception: the message received from the server could not parsed.common causes for this error are when the response is
modified by calls to response.write(),response filters,httpmodules,or server trace is enabled.
I have an aspx page and I want to access an application on the client after seeking user permission. Both the windows application and the website are to be made in VB.NET.
EDIT: Here is the problem. From my .aspx webpage in vb.net, a visitor clicks on a link on my site, and if my winform is not already loaded on their desktop, it is then loaded with the users permission. This application should auto-load on the user's site at boot up time and always be in the background running. Make it an extremely thin client, taking the least cpu and bandwidth from the user, and running as a silent background process until needed.
Whenever the user visits one of my many websites, IN ANY BROWSER, somehow - the app running in the background communicates with the .aspx on one of my sites, and exchanges a silent username password identifying client winform app to the online .aspx app on my website.
Then the .aspx on my site PASSES a url such as "www.somewebsite.com" to the app running in the background, the background app then does a http request from the client's computer, not from my .aspx server, so the client's cookies and ip are visible to "www.somewebsite.com" server. The client collects the html for that page, stores it as a string, and also saves the ascii of that webpage as another string.
Both strings then are PASSED BACK to my .aspx website that the client is visiting, and the .aspx app then stores these results in a database.
I can directly use to read and display Excel or CSV files using asp web control(GridView, sqldatasource etc). I do NOT want to upload the file first to an sql database before reading them, I just want to read the files directly. I am using asp.net 2.0 and c#.
I would like to access an Excel 2010 spreadsheet via ASP.NET 4 - what is the best (i.e. straight forward) method to do this? I would like to update the spreadsheet via ASP then read the results of the data from Excel back to a web form.
I have one C# windows class library type project which has a web reference whose settings are automatically added in to settings.settings file( Webservice name, type, scope, value).
I also have one separate ASP.net project which has let us as suppose, one page with a button. When I click this button, it calls a method of referred DLL of previous project and control goes there.
When in that project, when control goes in to location where I use this web reference, it tries to get the URL of web reference from settings file and raises an exception - 'The current configuration system does not support user-scoped settings'.
So, What is the way for me to call a c# project having web service in a asp.net project ? This is really a source stopper for our development.
I've got a webapplication and inside this webapplication I have a webservice. An external program is going to use this webservice in the future, but for now that is not the problem. this webservice is also called from inside the webapplication. this is where the problem starts.
I keep getting this error:
The remote server returned an error: (401) Unauthorized.
I tried with imporsonate= true, but it didn't work
[Code]....
the webservice is called like this:
[Code]....
I hope some one can point me into the right direction.
I have a URL (1) if i hit that URL using HttpWebRequest i get another URL (2) and if i hit the URL (2) i get XML and i process that XML and insert into my database.
I can hit the URL (1) and get the URL(2) but if i hit the URL (2) i am not getting XML. i think i need to pass some cookie info for authentication but i dont know how to do that in windows service [URL]
Can anyone explain why the following happens:My ASP.NET application requires access to Application event log.When I access web application initially, it returns "Security" exception (which is expected, as I haven't granted permissions to write to Application event log yet). Then I give read/write permissions to IIS_IUSRS group on the following registry key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetserviceseventlog. As a result of this action my web application starts working.Now I remove those permissions I've granted to IIS_IUSRS group. But my web application keeps working (although I'd expect "Security" exception raised again)So, why web application keeps working, although permissions to write to Application loghave been removed?
i have a Gridview and i m exporting that gridview into the excel,its working fine,i m using RenderControl to write the gridview data on to the Excel file but now what i want is, if i m disable that gridview and try to export the data its not export coz my gridview is Hidden . so is there any way i can also Export to Excel with disableing gridview. here is my code
I am loading documents into our Oracle database and then retrieving them for the users to view. So far PDF, DOC, XLS, CSV, etc. all perform as expected, however; DOCX, XLSX, etc. files have one annoyingly persistent issue. When the document is downloaded by the user and they open it you get the first in a series of messages: The file 'thefile.docx' cannot be opened because there are problems with the contents. Details: The file is corrupt and cannot be opened. and then: Word found unreadable content in 'thefile.docx'. Do you want to recover the contents of this document? If you trust the source, click Yes. After clicking yes the file opens and all of the content appears correct. Including images, formatting, tracked changeds and comments, equations, etc. I have tried multiple methods along these lines to no avail. I simply want the files to open without the false-positive error messages. I am using VS2010, with the website targeted at .Net Framework 2.0.
objConn = New OracleConnection(gstrConnectionString) objConn.Open() cmd = New OracleCommand cmd.Connection = objConn cmd.CommandText = "select DOCUMENT_NAME,DOCUMENT_TYPE,DOCUMENT from DOCUMENT_TABLE where DOCUMENT_ID='" & strDocumentID & "'" dr = cmd.ExecuteReader dr.Read()
