How to Download a file from server and save in local machine

protected void btnDownload_Click(object sender, EventArgs e)
{
//fileName = Name of the file to be downloaded from FTP server.

string filename = "c:\\test.txt";
string ftpServerIP = "IP address";
string ftpUserID = "User ID";
string ftpPassword = "Password";

FileInfo fileInf = new FileInfo(filename);

string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

FtpWebRequest reqFTP;

// Create FtpWebRequest object
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));

//Provide ftp userid and password
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// By default KeepAlive is true, where the control connection is not closed
// after a command is executed.
reqFTP.KeepAlive = false;

//Specify the command to be executed. Here we use upload file command
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

//data transfer type we use here is binary
reqFTP.UseBinary = true;

// Notify the server about the size of the uploaded file
reqFTP.ContentLength = fileInf.Length;

// The buffer size is set to 2kb
int buffLength = 2048;

byte[] buff = new byte[buffLength];

int contentLen;

// Opens a file stream (System.IO.FileStream) to read the file to be uploaded
FileStream fs = fileInf.OpenRead();

try
{

// Stream to which the file to be upload is written
Stream strm = reqFTP.GetRequestStream();

// Read from the file stream 2kb at a time
contentLen = fs.Read(buff, 0, buffLength);

// Till Stream content ends
while (contentLen != 0)
{

// Write Content from the file stream to the FTP Upload Stream
strm.Write(buff, 0, contentLen);
contentLen = fs.Read(buff, 0, buffLength);
}

// Close the file stream and the Request Stream
strm.Close();
fs.Close();
}
catch (Exception ex)
{
string ErrMsg = ex.Message;
}
}
}

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Try this

if (myfile.Exists) 

{        

Response.ContentType = "Application/pdf";

Response.AppendHeader("Content-Disposition", "attachment; filename=Demo.pdf");  // File name "Demo.pdf"

Response.TransmitFile(Server.MapPath(@"~\Downloads\Demo.pdf"));    // Set file location eg: www.domain.com\Downloads\Demo.pdf

Response.End();

}

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