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Is there any way to show an .DWG file in the browser using asp.net

I am trying to show an AutoCAD .DWG file in my web form.
I found this code in https://cadsofttools.com/products/cad-net/
...
using CADImport;
using CADImport.DWG;
using CADImport.DXF;
using CADImport.RasterImage;
...
private void Read_DWG_Click(object sender, EventArgs e)
{
//DWGImage class is used only for reading DWG. To read other formatsuse the corresponding classes.
//E.g. for DXF: CADImage class, for PLT/HPGL: HPGLImage class.
DWGImage vDrawing = new DWGImage();
vDrawing.LoadFromFile(#"..\..\..\Files\Gasket.dwg");
vDrawing.Draw(Image1.CreateGraphics(), new RectangleF(0, 0, (float)vDrawing.AbsWidth,
(float)vDrawing.AbsHeight)); // zooming and panning of the drawing are implemented
//in the demo Viewer via a special viewing control class CADPictureBox
}
I have already installed the required libraries and reference them in my web project. I have a problem with " Image1.CreateGraphics() " I don't know what is Image1!

Image1 is assuming a Windows Forms Image control. You are not going to be able to display the image in asp.net using that code.
You have more than one issue here when trying to display with asp.net. Also I'm not familiar with DWGImage or the related library. But you can try this:
using(var image = new Bitmap())
{
DWGImage vDrawing = new DWGImage();
vDrawing.LoadFromFile(#"..\..\..\Files\Gasket.dwg");
vDrawing.Draw(image, new RectangleF(0, 0, (float)vDrawing.AbsWidth,
(float)vDrawing.AbsHeight));
}
As a start, if that does not blow up and image does contain data (use your debugger to find out), then you can use a HttpHandler (.ashx) to show your image. Confirm that code above works then I can show you the HttpHandler code.

PrintDocument.PrinterSettings.Print() Changing default printer

I have the following code, to test out printing to a specific printer. The code sends the print to the correct printer. But I have notices upon completing the print, the systems default printer has changed.
I thought maybe at first maybe the PrinterName property was setting the default printer, and quickly realized that is not the case. I have to assume it is happening inside the Print() method.
I did some reading on changing the default printer, the solutions I found seemed to use the System.Management Namespace. But did not find anything related to changing the default printer back in the System.Drawing.Printing Namespace.
I figure there might be a simple way to change it back using the same Namespace that used it in the first place. Other than reprinting the document or a blank document to the previously default printer.
static void Main(string[] args)
{
Receipt();
}
static private void Receipt()
{
PrintDocument p = new PrintDocument();
p.PrinterSettings.PrinterName = "Star HSP7000 Receipt";
p.PrintPage += delegate(object sender1, PrintPageEventArgs e)
{
e.Graphics.DrawString("testtesttestest", new Font("Times New Roman", 12), new SolidBrush(Color.Black), new RectangleF(0, 0, p.DefaultPageSettings.PrintableArea.Width, p.DefaultPageSettings.PrintableArea.Height));
};
p.Print();
}

After asking this question, I continued searching, and found that windows 10 quietly manages the Default Printer to the last printer that is printed from (by default).
If you are having an issue on a windows 10 machine where the default printer is changing after a print job. Make sure to change this.

Unable to generate the rupee symbol (₹) using MigraDoc for C#

In the code snippet below, i am trying to embed the rupee symbol in the generated pdf document, but the pdf is rendering it as a square box instead of the symbol.
Using MigraDoc, i have set the unicode property to 'true' and fontembedding to 'always', but it still does not work. Can anyone help me out with a solution to this?
string value = "1000";
dataRow.Cells[4].AddParagraph("₹");

I tried the HelloWorld MigraDoc sample, just changed the line const bool unicode = true; to true (was false) and added some Rupee signs to this line paragraph.AddFormattedText("Hello, World! ₹₹₹", TextFormat.Bold);.
It worked as expected.
Please note that MigraDoc uses the Verdana font by default. To see the Rupee sign, MigraDoc has to use a font that has the Rupee sign. With older Windows versions you will have to use another font, not Verdana.
Remarks on Neville's answer: you do not have to use XPrivateFontCollection if you use fonts that are installed on the computer.
If a program is deployed to many computers, XPrivateFontCollection can be used to avoid installing fonts on all those computers.
If you use a program only on one computer, just install the font and use it without the font collection.

Finally figured out a way for this , below is my solution for all those who are also facing the same problem:
Download and install the Rupee Font here
Next, set it as the default font in your Visual Studio project using these instructions
Create a fonts folder in your Visual Studio and add the downloaded font in step 1.
Now add the following code
XPrivateFontCollection pfc = XPrivateFontCollection.Global;
Uri myuri = new Uri(#"D:\Test
Projects\SampleProjects\PdfGeneration\fonts\Rupee_Foradian.ttf");
pfc.Add(myuri, "./#Rupee Foradian");
double value = 1000;
dataRow.Cells[4].Format.Font.Name = "Rupee Foradian";
CultureInfo cinfo = new CultureInfo("hi-IN");
NumberFormatInfo numinfo = cinfo.NumberFormat;
numinfo.CurrencySymbol = "₹";
dataRow.Cells[4].AddParagraph(value.ToString("C", numinfo));
Note: To type the '₹" symbol, use the tilde key

POS Application Development - Receipt Printing

I've been building a POS application for a restaurant/bar. The design part is done and for the past month I've been coding it. Everything works fine except now I need to print. I have to print to a receipt printer connected to the computer running the software and later I'll try to print in a remote printer like a kitchen one.
I've searched for help in the matter only to find that the standard for printing in these types of printers is using POS for .NET. The thing is, this is now a bit outdated or at least it hasn't had any updates since a couple of years. There's a lot of questions being asked on how to use this library and most of the answers aren't quite easy to follow. So if anybody could give a step by step help on printing like a simple phrase ("Hello World") on a receipt printer i would be very grateful. I'm using visual studio 2012 running on a 64 bit windows 7 and i'm coding WPF in c#.

I know this is an old post, but for those still looking for a solution, I can tell you what I did.
After spending many hours messing with OPOS and POS for .Net, I ended up just abandoning those and just using the built-in System.Drawing.Printing libraries. The OPOS and POS for .Net ended up being a pain to get working and ultimately didn't work as well as the built-in libraries.
I'm using an Epson TM-T20II receipt printer.
Here's some code that worked well for me.
public static void PrintReceiptForTransaction()
{
PrintDocument recordDoc = new PrintDocument();
recordDoc.DocumentName = "Customer Receipt";
recordDoc.PrintPage += new PrintPageEventHandler(ReceiptPrinter.PrintReceiptPage); // function below
recordDoc.PrintController = new StandardPrintController(); // hides status dialog popup
// Comment if debugging
PrinterSettings ps = new PrinterSettings();
ps.PrinterName = "EPSON TM-T20II Receipt";
recordDoc.PrinterSettings = ps;
recordDoc.Print();
// --------------------------------------
// Uncomment if debugging - shows dialog instead
//PrintPreviewDialog printPrvDlg = new PrintPreviewDialog();
//printPrvDlg.Document = recordDoc;
//printPrvDlg.Width = 1200;
//printPrvDlg.Height = 800;
//printPrvDlg.ShowDialog();
// --------------------------------------
recordDoc.Dispose();
}
private static void PrintReceiptPage(object sender, PrintPageEventArgs e)
{
float x = 10;
float y = 5;
float width = 270.0F; // max width I found through trial and error
float height = 0F;
Font drawFontArial12Bold = new Font("Arial", 12, FontStyle.Bold);
Font drawFontArial10Regular = new Font("Arial", 10, FontStyle.Regular);
SolidBrush drawBrush = new SolidBrush(Color.Black);
// Set format of string.
StringFormat drawFormatCenter = new StringFormat();
drawFormatCenter.Alignment = StringAlignment.Center;
StringFormat drawFormatLeft = new StringFormat();
drawFormatLeft.Alignment = StringAlignment.Near;
StringFormat drawFormatRight = new StringFormat();
drawFormatRight.Alignment = StringAlignment.Far;
// Draw string to screen.
string text = "Company Name";
e.Graphics.DrawString(text, drawFontArial12Bold, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
y += e.Graphics.MeasureString(text, drawFontArial12Bold).Height;
text = "Address";
e.Graphics.DrawString(text, drawFontArial10Regular, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);
y += e.Graphics.MeasureString(text, drawFontArial10Regular).Height;
// ... and so on
}
Hopefully it helps someone skip all the messing around with custom drivers. :)

POS for .NET is probably the way to go.
Most receipt printer manufacturers will provide an OPOS service object.
And as this MSDN article states, POS for .NET is compatible with OPOS v1.8 service objects.
OPOS / UPOS (on which POS for .NET is based) is IMHO a poorly-designed API (designed by device manufacturers rather than application developers), but it's the best you have today.
I don't have any specific samples but the basics are the same as OPOS - you need to Open, Claim, Enable a device, then you can call its methods (such as Print). You might try looking at an OPOS sample, for example this PosPrinter1 sample, which will probably be very similar to POS for .NET.
This blog has some information about setting up POS for .NET that might be helpful.
UPDATE
Here's a VB Hello World for an OPOS printer. You first need to create a printer and add it to the registry with the required Logical Device Name = LDN. I believe the Epson ADK includes a utility to add a printer in the registry. This utility can also perform a health check on the printer to check it is installed correctly. Once you've done this, it should be easy enough to adapt the code below to POS for .NET
OPOSPOSPrinter.Open "MyPrinter" ' LDN of your printer
OPOSPOSPrinter.Claim 500 ' Timeout
OPOSPOSPrinter.DeviceEnabled = True
'- Print
OPOSPOSPrinter.PrintNormal 2, "Hello world"
'- Close the printer
If OPOSPOSPrinter.Claimed then
OPOSPOSPrinter.Release
End If
OPOSPOSPrinter.Close

.NET Printing
Printing under .NET isn't too difficult. Take a look here and on msdn.
Printing to a POS / receipt printer will be the same as printing to any other printer, assuming it is a Windows printer, network or otherwise. If you are using a serial printer, things may be a little more difficult because you will more then likely need to use manufacturer specific API's, fortunately though most good POS printers these days are fully supported by the OS.
First, you will need to add a reference to System.Printing dll to your project.
Then printing is as simple as
private void PrintText(string text)
{
var printDlg = new PrintDialog();
var doc = new FlowDocument(new Paragraph(new Run(text)));
doc.PagePadding = new Thickness(10);
printDlg.PrintDocument((doc as IDocumentPaginatorSource).DocumentPaginator, "Print Caption");
}
To use..
PrintText("Hello World");
You can also leverage the PrintDialog.PrintVisual and define your document using xaml template.
The print settings can be set using the PrintDialog properties.
Getting the printer you want to print to
private PrintQueue FindPrinter(string printerName)
{
var printers = new PrintServer().GetPrintQueues();
foreach (var printer in printers)
{
if (printer.FullName == printerName)
{
return printer;
}
}
return LocalPrintServer.GetDefaultPrintQueue();
}
A few things to keep in mind though when printing to a receipt printer, you will need to take into account formatting. More specifically you will need to consider the width of your page and how many characters you can fit on each line; this was a lot of trial and error for me, especially with different font sizes.
In most cases you don't really need to worry about paging, the printer will cut the paper automatically when it has completed your document.

If you want to print at the full speed of the printer, you will probably need to use printer-specific escape codes, and generate the "raw" output.
Have a look at Michael Buen's answer to this SO question, especially the UPDATE bit.

Why is there no exception if using not existing font? [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Test if a Font is installed
let say Im using an installed font on the system:
new System.Drawing.Font("Arial", 120F);
everything is fine. Now if I would use a not existing font:
new System.Drawing.Font("IdoNotExistHaHa", 120F);
I dont get any exception. As I see, if I use a font that doesnt exist I get a standard font (arial?, not sure). Whatever, I would like to throw an exception if there is a not found font. How to?

MSDN says as following :
For more information about how to construct fonts, see How to:
Construct Font Families and Fonts. Windows Forms applications support
TrueType fonts and have limited support for OpenType fonts. If you
attempt to use a font that is not supported, or the font is not
installed on the machine that is running the application, the
Microsoft Sans Serif font will be substituted.
You can check the if the font is correct by doing as following :
var myFont = new Font(fontName)
if (myFont.Name != fontName )
{
throw new Exception()
}

You can see it in documentation itself, Font Constructor (String, Single)
Windows Forms applications support TrueType fonts and have limited
support for OpenType fonts. If the familyName parameter specifies a
font that is not installed on the machine running the application or
is not supported, Microsoft Sans Serif will be substituted.
In short, default font is Microsoft Sans Serif

You could check and see if the font is installed first.
From Jeff Hillman's answer here: Test if a Font is installed
string fontName = "Consolas";
float fontSize = 12;
Font fontTester = new Font(
fontName,
fontSize,
FontStyle.Regular,
GraphicsUnit.Pixel );
if ( fontTester.Name == fontName )
{
// Font exists
}
else
{
// Font doesn't exist
}
Obviously, you could then throw an exception if you wanted(as that is your original question), although I would recommend not to, throwing an exception is an expensive operation if you can handle the issue more gracefully without.