how to get file from http server and then print it?

try to give the relative path not the absolute path
use Server.Mappath() for giving the path to the printdoc function

try this code

class PrintDoc : PrintDocument
{
public Font font;
string text;
protected override void OnPrintPage(PrintPageEventArgs e)
{
base.OnPrintPage(e);
if (text == null) text = File.ReadAllText(this.DocumentName);
int chars, lines;
SizeF textSize = e.Graphics.MeasureString(text, font, e.MarginBounds.Size, StringFormat.GenericTypographic, out chars, out lines);
string textDrawn = text.Substring(0, chars);
e.Graphics.DrawString(textDrawn, font, Brushes.Black, e.MarginBounds.Location);
if (chars < text.Length)
{
text = text.Substring(chars);
e.HasMorePages = true;
}
}
}

on button click

PrintDoc doc = new PrintDoc();
doc.DocumentName = @"C:\Users\daljeet\Desktop\Modified_Files_Name.txt";
doc.font = new Font("Consolas", 9);
doc.Print();