Download pdf file from folder by using datagridview link label in C#

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folder path is saved in a table database
i have to show all the datas from the table in datagridview
and when click the "file_name.pdf " ,that pdf file has to be downloaded
please help

i got the error that adobe reader does not read the pdf file and something like that

"Adobe reader coudln't read downloaed pdf file in C# datagridview cellcontent click":

What I have tried:

  string Calibaration = gvCalibration.Rows[e.RowIndex].Cells["CalibrationCertificate"].Value.ToString();
string targetPath = System.Windows.Forms.Application.StartupPath + "\\App_Data\\CalibrationCertificate\\";
string Calfilename;
 Calfilename = Path.GetFileName(Calibaration);
 string extn = Path.GetExtension(Calibaration);
  var byteData = Encoding.UTF8.GetBytes(Calfilename);

using (SaveFileDialog sfd = new SaveFileDialog())
    {
 //Set Save dialog properties
  //sfd.Filter = "Text files (*.txt) | *.txt | All files(*.*) | *.* ";
 sfd.Filter = "Files (*" + extn + ")|*" + extn;
sfd.Title = "Save File as";
 sfd.CheckPathExists = true;
 sfd.RestoreDirectory = true;
  sfd.FileName = Calfilename;

 if (sfd.ShowDialog() != DialogResult.OK || string.IsNullOrEmpty(sfd.FileName))
                            {
                                return;
                            }

 using (var saveFileDialogStream = sfd.OpenFile())
                            {
  saveFileDialogStream.Write(byteData, 0, byteData.Length);
                            }

}

Posted 6-Apr-22 21:50pm

Kanaga Lakshmi from Delhi

Updated 6-Apr-22 22:37pm

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Chris Copeland · Answer 1 · 2022-04-06T22:37:00

If you're saying the file is saved successfully but Adobe Reader is throwing an error it's probably because you're not actually copying the file correctly. If you look here:

C#

var byteData = Encoding.UTF8.GetBytes(Calfilename);

using (var saveFileDialogStream = sfd.OpenFile())
{
  saveFileDialogStream.Write(byteData, 0, byteData.Length);
}

The value of byteData here isn't the contents of the file, Encoding.UTF8.GetBytes() converts whatever value is passed into it into a byte array, it doesn't read the contents of the file.

Instead you need to use the variables you've instantiated in the code. I assume that targetPath is where the files are stored, and Calfilename is the name of the file, so to get the file contents you can do:

C#

var byteData = File.ReadAllBytes(targetPath + Calfilename);