Downloaded file has broken its format

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I have written a code for my web application, i which i am uploading some files (Pdf and png etc) and displaying the files in the gridview. I am desirous to download the uploaded file from gridview on clicking the row. I have successfully done that task, but when i open the downloaded file, i face the error that "File is unable to open". How i can get rid from that.

Here is my code which i am using to download the file from the gridview.

What I have tried:

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Download") {

Response.Clear();
Response.ContentType = "application/octect-stream";
Response.AppendHeader("content-disposition","filename="+ e.CommandArgument);

Response.End();
}
}

Posted 23-Apr-17 7:40am

Hassaan_Malik

Updated 23-Apr-17 21:28pm

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Comments

Dave Kreskowiak 23-Apr-17 14:23pm

Do you want to take a real close look at that code you posted? Where are you sending the content of the file back to the client? So far, you just created a header for the file you're sending back, not the file itself.

Hassaan_Malik 23-Apr-17 14:27pm

I am beginner to asp.net. its my first interaction with that. Can you please slightly guide me regard that or can you please send me any useful link from where i can get help?. Any sort of help will be highly appreciated. Please

[no name] 23-Apr-17 14:31pm

https://www.asp.net/web-forms/books

You aren't going to get your project done by guessing and asking question after question. You need to learn the correct way.

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Member 12893295 · Answer 1 · 2017-04-23T21:28:00

you need to do like below code

string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
    string contentType = FileUpload1.PostedFile.ContentType;
Stream fs = FileUpload1.PostedFile.InputStream;
BinaryReader br = new BinaryReader(fs);
byte[] bytes = br.ReadBytes((Int32)fs.Length);

Response.Clear();
    Response.Buffer = true;
    Response.Charset = "";
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.ContentType = contentType;
    Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
    Response.BinaryWrite(bytes);
    Response.Flush();
    Response.End();

code is not tested you need to check