.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

reading excel file without saving to disk first

Posted By:      Posted Date: August 31, 2010    Points: 0   Category :ASP.Net
Having an issue.  I need to be able to read an excel file from a file upload control but I can not save the file to disk first, it must be done in memory.string excelConnectionstring = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="; excelConnectionstring += filePath.Replace("/", "\\"); excelConnectionstring += ";Extended Properties='Excel 8.0;HDR=YES;IMEX=1;'"; OleDbConnection con = new OleDbConnection(excelConnectionstring); OleDbDataAdapter da = new OleDbDataAdapter();Above is my code for reading the data file if it IS saved to disk, but again, I have to be able to do this without saving the file to disk, it must be done in memory.  I have not been able to find any sample code anywhere on how to do this from memory, everything seems to force the file be uploaded, saved to disk, and then read in the connection string, which again I can not do.Any advise would be great, thanks in advance.  I'm really in a bind here.

View Complete Post

More Related Resource Links

reading excel file problem



i have 200 rows in my excel file. im using OleDbConnection to read the excel file.

The problem is that it will read all the blank rows from row 200 onwards. Is there a configuration im missing ? or is there a way to import all rows that has data? Here's some of my code.

string excelConnectionString =
               "Provider=Microsoft.Jet.OLEDB.4.0;" +
                "Data Source=" + filePath + ";" +
                "Extended Properties=Excel 8.0";

OleDbConnection excelConnection =
                    new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=NO'");

OleDbCommand cmd = new OleDbCommand("Select * from [list$]",excelConnection);

Reading an excel file



i am trying to read an excel file.

when i read the entire file, it works fine.

but when i try to read a single column, i get the following exception message:

"Could not find installable ISAM".

the code i am using is:

string  connString = "Provider=Microsoft.ACE.OLEDB.12.0;" +  


"Data Source="+ fileName + ";" +


"Extended Properties=Excel 12.0;HDR=Yes";

OleDbConnection oledbConn = new OleDbConnection(connString);




// Open connection



// Create OleDbCommand object and select data from worksheet Sheet1

OleDbCommand cmd = new OleDbCommand

VB.NET Saving Excel File

Hi, I am exporting my values in my textboxes to an excel spreadsheet (user clicks "Export" button on form). After it is done, it asks me if i want to overwrite my current excel spreadsheet. Is there a way that I can open a save as dialog box so I can choose what name and where to save it? Thanks   Private Sub ResultsExcelbgw_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles ResultsExcelbgw.DoWork Dim Resultsdata As ResultsDataDef = DirectCast(e.Argument, ResultsDataDef) Dim xlApp As Excel.Application Dim xlWorkBook As Excel.Workbook Dim xlWorkSheet As Excel.Worksheet Try xlApp = New Excel.ApplicationClass xlWorkBook = xlApp.Workbooks.Open("C:\program files\Noxious Weeds Report\Reports\nw_budget_Summary.xlsx") xlWorkSheet = xlWorkBook.Worksheets("sheet1") Catch ex As Exception MessageBox.Show("Excel connection error: Please contact your System Administrator.", "Communication Error", MessageBoxButtons.OK, MessageBoxIcon.Error) Exit Sub End Try 'Use message box below to check current value in excel if needed 'MsgBox(xlWorkSheet.Cells(1, 1).value) 'edit the cell with new value Try xlWorkSheet.Cells(1, 1) = Resultsgrpbox.Text xlWorkSheet.Cells(18, 1) = "Report Generated: &quo

Reading from Excel file : win form

Hi All, I have the following requirement  There are 10 Excel files in a folder.Each excel file contains only 1 column which contains severeal IDs listed. Now, I want to read those IDs in each & every excel file. How do I get the count of number of excel files present in that folder?? After getting the count, how do I read each Id present in that file?? Any help will be greatly apprecited.. Thanks, Alex

Need help - reading hyperlinked page in excel file using c#


Ok, I understand how to use a connection string object to read excel sheets. What I don't know is how to follow a hyperlink inside excel, grab matching data from the linked page and return it to my database. Essentially, the spreadsheet has two columns:

Title  |  Class#

Class# has the hyperlink which links to an internal web site. The connected page has a course description and any pre-required classes that must be taken before you can take this class. This is where I'm rather stumped as I've not had to do this type of thing before. Any code, links or pointers would be appreciated. Many thanks.

Reading Excel File from document library in sharepoint 2010


On a button click,I want to read a excel file placed in document library in sharepoint 2010.The button is in a visual web part.

I am giving the connection string as:



connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=http://server_name/Doc librar

Reading and Writing Data to/from Excel File


I need to read and write data from excel sheet. Firstly for example I need to use the concept of accessing workgroup, sheet and then cells whatever I want.

For example I need to use cell A1+B1 and put the result in C1

alternatively I can use the same function above and put data in some other sheet of same excel file.

Please reply the answer either using C#.NET or asp.net using C#.NET

Creating Excel file from C#

I used below coding for create a excel sheet.I got from on web site.
In below coding there is no problem.Its create the excel file.If i run second time,its ask to overwrite the current excel file.If I said "Yes" then it ok ,but If I select cancel button,its generate the Error message.The exception is

The Free Barcode Creator produces barcode images one at a time, and allows easy saving to a file or

The Free Barcode Creator produces barcode images one at a time, and allows easy saving to a file or pasting into an application. 2D versions are also available:

Does this look correct for saving a file/ new record to a database


So thank you for all your help so far, So I think i got this right,
but would like for you all to look it over to see if there is any
areas I might run into trouble with:

//using asp.net mvc 2
the table (sql server 2005, using entities framework)
table fields
"Pattern_Media_GUID  uniqueid 
"Pattern_GUID  uniqueid
"Media varbinary(max)  
"height int
"Width int
"Media_Type String (50)

the form:
<h2> Add Media to this pattern</h2>
<% Html.EnableClientValidation(); %>
<% Html.BeginForm("AddMedia", "Pattern", new { id= Model.Pattern_Guid} , FormMethod.Post, new {enctype = "multipart/form-data"}); %>
    <%: Html.Label("height") %>
    <%: Html.TextBox("height") %>

    <%: Html.Label("width") %>
    <%: Html.TextBox("width") %>

    <%: Html.Label("Media") %>
    <input type="file" id="Media" name="Media" />
    <input type="submit" name=

file upload in chunks or not buffering in memory before writing to disk?


What are the options for handling file uploads to reduce the memory footprint?  Is there a way to upload in chunks?  Is there a way to stream upload directly to disk instead of loading entire file in server memory?


Convert excel file into xml


Hai, I have two columns with id,name in the excel sheet.I want to convert into xml file in the below format

<?xml version="1.0" encoding="utf-8"?>

<guide xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <Boat id="1"> <name> Copper Kettle </name> </Boat> <Boat id="2"> <name> Copper Penny </name> </Boat> <Boat id="3"> <name> Copperhead </name> </Boat> <Boat id="4"> <name> Coppertone </name> </Boat> <Boat id="5"> <name> Copy Boy </name> </Boat> </guide>

suggest me with sample code in ASP.NET. Thanks


Read Excel file from Web Application (C#)



I have a web app where user uploads a file.

File is saved in server locally and I want to read some data from it.

Currently my development  server has office 2003.

So do I need office 2007 in order to be able to  read an excel from office 2007 ?

What are other requirements  ?

I tried a test, using

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

wrkBook = excelApp.Workbooks.Open(@"C:\www\excel_files\b.xls", ....);

But When trying to open the file I get the error:

Exception from HRESULT: 0x800A03EC

So I'm wondering what I'm missing.


While Importing Excel 2007 file to Datatable - headerrow problem


Hi there,


I am trying to simply extract an excel data from an uploaded file an put it into a datatable. In this case the excel file has 3 rows but when I fill the datatable I only see row count of 2.

I tried changing HDR:NO; to HDR:YES and vice versa, but no luck. 

What am I doing wrong? (Note: the excel file cannot have a  headerrow)


string connstr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + pFilePath + ";Extended Properties=\"Excel 12.0;IMEX=1;HDR:NO;\"";
            OleDbConnection conn = new OleDbConnection(connstr);
            DataTable dtTables = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
            string strTablename = dtTables.Rows[0]["TABLE_NAME"].ToString();
            string strSQL = "SELECT * FROM [" + strTablename + "]";

            OleDbCommand cmd = new OleDbCommand(strSQL, conn);

            DataTable dt = new DataTable();
            OleDbDataAdapter da = new OleDbDataAdapter(cmd);
            //At this point row count=2 which doesn't make sense




Returning datas from two excel file



I used the below code to return the datas from one excel file. My question is if i suppose need to get the records from morethan one excel file using joins, how it is possible.

   string connString = ConfigurationManager.ConnectionStrings["xls"].ConnectionString;
        // Create the connection object 
        OleDbConnection oledbConn = new OleDbConnection(connString);
         // Open connection
            // 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, "Employees");




Excel file getting error


when i am trying to save a excel document in library it getting error like "The file cannot be saved because some properties are missing or invalid"

If anyone know the solution for this pls tell me.



Excel file not showing in search results

We have a strange issue. I have one Excel document (or at least one that I am aware of) that will not show up in search results for content within the document. I can find the document by title just fine, but when I search for words within the document I do not see it. The document was originally a 2003 Excel document and was recently converted to 2007. Other than that there isn't really anything unusual about it (some formatting stuff, but mainly just background colors and whatnot, nothing fancy). The crawl log shows the document was crawled without error. Anyone know anything else I can check on?
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend