Databases :: Creating, Opening, Writing To Excel Files?
Aug 5, 2010
I am creating an site where a user uploads an excel file to check if any of the records exist in a database. Then they are returned an excel file with only the records that are NOT in the database.
I was thinking I should do it this way1. User uploads their excel file. The app opens excel file and loads records into a dataset (so far this is working with the code below)2. Using datarow and another function to check if each excel record exists in the database3 If the record does NOT exist, and it is the first record tested, create an excel file called records.xlsx and write the record into the file
4. Check the next record and if it does NOT exist in the database, then check if records.xlsx already exists then open it and write it into it.
[Code]....
Hopefully its clear, sorry if its not, I'm a bit of a novice at this. Is this a good way to do it? Does anyone know of any tutorials that might outline how to open an existing file and write to it?
Want to create a web based application for reading and writing excel files.
Issue :
1. Want to upload an excel file and store it some location. 2. Read data from excel file, performing some sorting and filtering 3. Write filtered data to new excel file.
I'm populating a generic list from an excel file that contains names of pdf files. Now I want to take each item in the list and create a file from it. Here's what I have so far:
[Code]....
So now, the list called lines contains names of 900 pdf files. How would I take those names out of the list and create files from them?
I am writing to excel file using jet driver. If the length of value exceeds 255 characters i get the below error.'The field is too small to accept the amount of data you attempted to add. Try inserting or pasting less data'Please could you provide a solution to how can i add values with length greater than 255. Excel file is 97-2003 format.
System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand();
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i'm trying to read an excel file and get data on a row by row basis. Since after converting the pdf file into an excel file, the formatting went a bit haywire but if read row by row, i'm still able to retrieve the original data.
As I am unable to generate the excel file using a single worksheet, i have multiple sheets in the excel file. I also need help on reading multiple sheets.
Currently i am onli able to get data via columns but due to the formatting going haywire, i gave up on it.
how can i programatically create table in sql2005 from exisiting dbase or dbf file along with data in the files.....
wat i mean is that program shuld read the existing dbf/dbase/excel file,, create table with the same structure and data as in the exisiting dbase/dbf files..
My Visual Studio 2005 program doesn't open CSS files properly - when I open them in VS, it opens them as a text file. It is annoying because if I do something wrong, it doesn't show up the error and I have to sift through it all to try and find out what is wrong. Plus it doesn't show up the hints for the attributes.
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However, I have a mysql db also hosted on my site, and I'm connecting to it ok, but the loop is failing. There are 2 tables, one stores the category, and the other stores link data.
For each category
write to the category table for each link in this category write to the link table next next
The tables are being created, and the very first category is written to the table, but then nothing gets written to the link table.
How can I make this generate an error message? My webhost doesn't know what to do about it and they just want to see an error message.
I tried this once already, and neither of my lines worked:
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how do you reference file paths for opening files in asp.net web apps? i have a class defined in the asp.net project which calls another class in another project which opens a file. specifying something like "~/app_data/file.txt" does not work of course.
using Server.MapPath is not an option because the class is not used in the context of an .aspx.cs page. is there a way to get the full path of "/app_data/file.txt" without being in the context of the aspx page? in other words determining it from raw c# code? the object would need to know its web context.
i do not want to hard card references to files in app_data....
the scenario is using a stream to open a file for reading....
I'm trying to use the COM interop assembly to export some data to an Excel workbook for an ASP.NET web application. This works fine in development, since the server and the client are the same machine. However, when deployed, this is not the case. The deployed version does not throw an exception, but it also does not open Excel on the local machine (since ASP.NET is executed server-side, this is pretty obvious).
How do I go about creating an Excel application on the client's machine?
I am building a site which allows people to upload excel files to a secure D: on the IIS server. I am using the impersonate function (with username and password in webconfig) to allow people to save the files to the secure
Can someone point me in the right direction how I can then allow users to retireve / open these files? I have tried :
i'm using stream writer to write a text file on client machine, but everytime while i'm writing a new file it over writes the existing one..so now i need to write seperate file each time ...and also i need to create a folder dynamically for first time and save text files in that folder when everytime i use my application....
