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System.Diagnostics.Process.Start() doesn't work in the web server
MySqlDataReader Reader = null;
connection.Open();
MySqlCommand command = new MySqlCommand("Select Image, File_Type, File_Name from table where ImageID = " + ImageID, connection);
Reader = command.ExecuteReader();

if (Reader.Read())
{
    byte[] buffer = (byte[])Reader["Image"];
    System.IO.MemoryStream stream1 = new System.IO.MemoryStream(buffer, true);
    stream1.Write(buffer, 0, buffer.Length);

    String fileName = Reader["File_Name"].ToString();
    String dirName = "C:\thefolder\";
    if (!Directory.Exists(dirName))
    {
        // if not then create
        Directory.CreateDirectory(dirName);
    }
    if (File.Exists(dirName+fileName))
        File.Delete(dirName + fileName);
    Directory.CreateDirectory(Path.GetDirectoryName(Reader["File_Name"].ToString()));

    using (Stream file = File.Create(dirName + fileName))
    {
        file.Write(buffer, 0, buffer.Length);
    }
    Process process = new Process();
    process.StartInfo.FileName = "AcroRd32.exe";
    process.Start();
}

//Process process = new Process();
//process.StartInfo.FileName = "AcroRd32.exe";
//process.Start();
Response.ClearHeaders();
Response.ContentType = "application/pdf";
Response.Clear();
Response.AppendHeader("Content-Disposition", "attachment");
Response.TransmitFile(dirName + fileName);
Response.End();