How to download a selected file from gridview. I need to download the selected file in another page using session

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I am new to this, I have created a website in which user logs in and searches a file and tries to download it. But user can download it only after giving a secret key. My question is how to download the selected file from gridview after the validation?

Posted 8-Mar-15 23:20pm

Prabhu92

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Modi Mayank 9-Mar-15 10:56am

Just for other users reference, here is the complete tutorial on uploading and downloading selected file from gridview.

2 solutions

Solution 1

Hi,
Check these :
http://www.aspsnippets.com/Articles/Download-multiple-files-as-Zip-Archive-File-using-GridView-in-ASPNet.aspx[^]
http://www.bipinjoshi.net/articles/2cd48325-5523-4442-98a8-63f12dba567b.aspx[^]

Posted 8-Mar-15 23:24pm

Praneet Nadkar

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**Manoj K Bhoir** · Accepted Answer · 2015-03-08T23:38:00

Solution 2

Hi, You can achieve this using different ways. If your grid contains uri of the file you want to download then just call below function by passing download file path as a parameter.

C#

public void DownloadFile(string filePath)
{
  Response.ClearContent();
  Response.Clear();
  Response.ContentType = "APPLICATION/OCTET-STREAM";
  String Header = "Attachment; Filename=\"" +   "FileName.pdf" + "\"";
  Response.AppendHeader("Content-Disposition", Header);
  System.IO.FileInfo Dfile = new System.IO.FileInfo(filePath);
  Response.WriteFile(Dfile.FullName);
  //Don't forget to add the following line
  Response.End();
}

I hope this will help you. :)

Posted 8-Mar-15 23:38pm

Manoj K Bhoir

Comments

Prabhu92 9-Mar-15 5:55am

Thanks for your reply. I am downloading the file from the database. My question is when the user selects the file from the gridview he need to download the file after giving the secret key. So how to download the file after the validation.

Thanks in advance

Prabhu92 9-Mar-15 5:58am

"Enter secret Key option" is in the next page. So how to download the selected file in the next page. Is it possible to use Session?

Manoj K Bhoir 9-Mar-15 6:42am

Yes you can use Session or you can validate your secrete key on same page and if validation is successful then redirect to download page. Also if you are storing your file into the database in byte() format replace Response.WriteFile(Dfile.FullName); this line with
Response.BinaryWrite(bytes); to download file where byte is the array of file contents.

Prabhu92 9-Mar-15 6:58am

Thanks a lot

Manoj K Bhoir 9-Mar-15 7:09am

Welcome. :)

Prabhu92 9-Mar-15 8:34am

Getting an error "System.IndexOutOfRangeException"
Below is my code
Byte[] bytes = (Byte[])dr["FileData"];
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = dr["FileType"].ToString();
Response.AddHeader("content-disposition", "attachment;filename=" + dr["FileName"].ToString());
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();

Manoj K Bhoir 9-Mar-15 8:43am

On which line you are getting this exception?

Prabhu92 9-Mar-15 8:44am

Below is my code
Byte[] bytes = (Byte[])dr["FileData"];//System.IndexOutOfRangeException"
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = dr["FileType"].ToString();//System.IndexOutOfRangeException"
Response.AddHeader("content-disposition", "attachment;filename=" + dr["FileName"].ToString());
Response.BinaryWrite(bytes);
Response.Flush();
Response.End()

Manoj K Bhoir 9-Mar-15 9:00am

It means where ever you are using data reader object you are getting Invalid Index Exception.
Please try to debug your code and ensure that your sql query returns proper result.
Also ensure that, column name you are using in dr[“ColumnName”] are proper.
Try to set quick watch while debugging on dr object.
Also if error still exist try using index instead of column name like dr[0];, dr[1];

Prabhu92 9-Mar-15 9:07am

Thanks for your response. I will give a try

Prabhu92 9-Mar-15 9:09am

You are Genius man. Thanks a lot. Its working!!

Manoj K Bhoir 9-Mar-15 9:18am

Welcome :)