Solved

Convert datatable to excel or csv file and save to client computer(asp.net application)

Posted on 2010-09-14
3
665 Views
Last Modified: 2012-05-10
On the click of a button I pass a datatable to a method to generate an excel file.
Since this is a web application I want to be able to use a file dialog to save the file
locally to my computer.

how can i acheive this pls ?




/// <summary>

    /// The click of this button will convert the datatable to csv format and save in the c:\directory

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    protected void btnExcel_Click(object sender, EventArgs e)

    {

        SaveDataTableToCsvFile(@"c:\sample.csv", dtg, ",");

    }





    public static void SaveDataTableToCsvFile(string AbsolutePathAndFileName, DataTable TheDataTable, params string[] Options)

    {



        try

        {

            //variables

            string separator;

            if (Options.Length > 0)

            {

                separator = Options[0];

            }

            else

            {

                separator = ","; //default

            }

            string quote = "\"";



            //create CSV file

            StreamWriter sw = new StreamWriter(AbsolutePathAndFileName);

           

            //write header line

            int iColCount = TheDataTable.Columns.Count;

            for (int i = 0; i < iColCount; i++)

            {

                sw.Write(TheDataTable.Columns[i]);

                if (i < iColCount - 1)

                {

                    sw.Write(separator);

                }

            }

            sw.Write(sw.NewLine);



            //write rows

            foreach (DataRow dr in TheDataTable.Rows)

            {

                for (int i = 0; i < iColCount; i++)

                {

                    if (!Convert.IsDBNull(dr[i]))

                    {

                        string data = dr[i].ToString();

                        data = data.Replace("\"", "\\\"");

                        sw.Write(quote + data + quote);

                    }

                    if (i < iColCount - 1)

                    {

                        sw.Write(separator);

                    }

                }

                sw.Write(sw.NewLine);

            }

            sw.Close();

        }

        catch (Exception ex)

        {

            //MessageBox.Show(ex.Message);

        }

    }

Open in new window

0
Comment
Question by:Sirdots
3 Comments
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 33679030
Since the code you have will be executed on the SERVER, not on the client, you may have a bit of a problem.  

Generally, web apps do not have WRITE permission on the client - that would be a serious security hole.

AW
0
 
LVL 42

Accepted Solution

by:
sedgwick earned 500 total points
ID: 33679811
attached is a function which exports datatable to csv.

to enable saving it on the local computer you can stream the csv file to the client browser:

HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.AddHeader( "content-disposition","attachment;
filename=" + <filename>);
HttpContext.Current.Response.BinaryWrite(File.ReadAllBytes(<filename>));
HttpContext.Current.Response.End();

<filename> - csv file path


http://dotnetguts.blogspot.com/2007/01/exporting-datatable-to-csv-file-format.html
http://www.velocityreviews.com/forums/t92977-csv-file-download-from-an-asp-net-page-issue.html
public static void ExportToCSV(DataTable dt, string strFilePath, string fileName)
        {
            var sw = new StreamWriter(strFilePath + fileName, false);

            // Write the headers.
            int iColCount = dt.Columns.Count;
            for (int i = 0; i < iColCount; i++)
            {
                sw.Write(dt.Columns[i]);
                if (i < iColCount - 1) sw.Write(",");
            }

            sw.Write(sw.NewLine);

            // Write rows.
            foreach (DataRow dr in dt.Rows)
            {
                for (int i = 0; i < iColCount; i++)
                {
                    if (!Convert.IsDBNull(dr[i]))
                    {
                        if (dr[i].ToString().StartsWith("0"))
                        {
                            sw.Write(@"=""" + dr[i] + @"""");
                        }
                        else
                        {
                            sw.Write(dr[i].ToString());
                        }
                    }

                    if (i < iColCount - 1) sw.Write(",");
                }
                sw.Write(sw.NewLine);
            }

            sw.Close();
        }

Open in new window

0
 

Author Closing Comment

by:Sirdots
ID: 33855368
The file dialog was not shown here
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

AJAX ModalPopupExtender has a required property "TargetControlID" which may seem to be very confusing to new users. It means the server control that will be extended by the ModalPopup, for instance, if when you click a button, a ModalPopup displays,…
In this Article, I will provide a few tips in problem and solution manner. Opening an ASPX page in Visual studio 2003 is very slow. To make it fast, please do follow below steps:   Open the Solution/Project. Right click the ASPX file to b…
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now