CODEWITHSUNDEEP
c#asp.netvisual-studio-2010
user3167150
user3167150

Reputation: 187

How to download file with asp.net on buttton's onClick event?

I have a String variable (in C#) that contain the full path of PDF file on my server (like that "~/doc/help.pdf").

I want that in click on button, this file will download to the client computer.

I created a button and made onClick event in C#. Now, which code should I write to do that?

Upvotes: 6

Views: 75184

Answers (6)

Code
Code

Reputation: 739

 string path;
            string filename = "Page-3" + ".Pdf";
            path = "~/H/Emp/" + filename.ToString();
            Response.ContentType = "image/jpg";
            Response.AddHeader("Content-Disposition", "attachment;filename=\"" + filename.ToString());
            Response.TransmitFile(Server.MapPath(path));
            Response.End();

Upvotes: 0

user9844939
user9844939

Reputation: 1

Response.ContentType = "Application/pdf";

Response.AppendHeader("Content-Disposition", "attachment; filename=File_Name.pdf");

Response.TransmitFile(Server.MapPath("Folder_Name/File_Name.pdf"));

Response.End();

Upvotes: -1

DA Luces
DA Luces

Reputation: 49

Try this code on your btn_Click:

Response.Redirect("~/doc/link.pdf");

Upvotes: 3

naed21
naed21

Reputation: 155

I would suggest the following to be placed into your button click event code.

This will provide the user with a popup to download the file. I've tested it thoroughly and use it in production code.

void btnDownloadFile_Click(object sender, EventArgs e)
{    
    string strLocalFilePath = "~/doc/help.pdf";
    string fileName = "help.pdf";

    Response.Clear();

    Stream iStream = null;

    const int bufferSize = 64 * 1024;

    byte[] buffer = new Byte[bufferSize];

    int length;

    long dataToRead;

    try
    {
        iStream = new FileStream(strLocalFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
        dataToRead = iStream.Length;
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);

        while (dataToRead > 0)
        {
            if (Response.IsClientConnected)
            {
                length = iStream.Read(buffer, 0, bufferSize);
                Response.OutputStream.Write(buffer, 0, length);
                Response.Flush();
                buffer = new byte[bufferSize];
                dataToRead = dataToRead - length;
            }
            else
            {
                //prevent infinate loop on disconnect
                dataToRead = -1;
            }
        }
    }
    catch (Exception ex)
    {
        //Your exception handling here
    }
    finally
    {
        if (iStream != null)
        {
            iStream.Close();
        }
        Response.Close();
    }
}

Upvotes: 1

Krishanu Dey
Krishanu Dey

Reputation: 6406

I think you are looking for something like this.

private void Button1_click(object sender, System.EventArgs e)
{
    Response.ContentType = "Application/pdf";
    Response.AppendHeader("Content-Disposition", "attachment; filename=help.pdf");
    Response.TransmitFile(Server.MapPath("~/doc/help.pdf"));
    Response.End();
}

Upvotes: 28

pid
pid

Reputation: 11597

With an ASP button:

button.OnClientClick = string.Format("javascript:window.location='{0}'", pdfLink);

The logic behind this is here: Client-side click

This will not reload the page and do a post-back, it will just navigate to the PDF which will be displayed in the browser.

Set the button's onclick event to this scriptlet:

onclick="javascript:window.location='/doc/help.pdf'"

To create that server-side:

<input type="button" onclick="javascript:window.location='<%=PDFLink %>'" />

Where PDFLink is a string property in the code behind:

public string PDFLink
{
    get
    {
        return "/doc/link.pdf";
    }
}

From here it should be trivial to take the string from the database and render it absolute if need be.

Upvotes: 0

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