Object reference not set to an instance of an object.

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I would like to develop window application to generate the pdf file with the help of pdfsharp.dll file. While run the program i got an error like Object reference not set to an instance of an object
Here is my code

C#

 private void button1_Click(object sender, EventArgs e)
        {
            PdfDocument pdf = new PdfDocument();
            PdfPage pg = pdf.AddPage();
            XGraphics grp = XGraphics.FromPdfPage(pg);
            grp.MUH = PdfFontEncoding.Unicode;
            grp.MFEH = PdfFontEmbedding.Default;
            XFont ft = new XFont("Microsoft Sans Serif", 15, XFontStyle.Bold);
            grp.DrawString("Hazardous Situation or Incident Record", ft, XBrushes.LightGreen, new XRect(0, 0, pg.Width.Point, pg.Height.Point), XStringFormats.TopCenter);
            string pdffilename = "Hazardous situation(or)Incident Record";
            pdf.Save(pdffilename);
            Process.Start(pdffilename);
            this.Close();
            XPen pn = new XPen(XColors.Blue, 2);
            grp.DrawLine(pn, 2, 80, 612, 80);
}

I got an error at last line.

Posted 22-Dec-14 2:01am

Divakard3

Updated 22-Dec-14 2:03am

Thanks7872

v2

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Comments

Kornfeld Eliyahu Peter 22-Dec-14 8:05am

Why that this.close() is in the middle of nothing? Why it is there at all?

Divakard3 22-Dec-14 8:06am

i would like close the windows form when click the generate pdf button.

Sinisa Hajnal 22-Dec-14 8:08am

Call close AFTER all other methods are finished. That should probably be the last line.

BillWoodruff 22-Dec-14 8:07am

Put a break-point on the first line of code in the Button Click EventHandler, then single-step through the code (F11): locate the source of the error, and then ask a question here including a description of the error, and where it occurred.

Maciej Los 22-Dec-14 8:14am

My virtual 5!

Divakard3 22-Dec-14 8:16am

i can't get understand

Maciej Los 22-Dec-14 8:19am

It means: i appreciate this comment.
Please, do exactly what Bill wrote.

Sinisa Hajnal 22-Dec-14 8:07am

If it is at the last line, obviously either your grp or pn is null. Check them and resolve it. This isn't an error for CP, but for you and your debugger.

2 solutions

Solution 1

it is because you are trying to draw a line after the form is closed. Fix that part and everything will go fine

Posted 22-Dec-14 2:24am

agent_kruger

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Maciej Los · Accepted Answer · 2014-12-22T02:27:00

First of all, read all comments to your question. Secondly, be careful with code context and do not use objects that without a context.

Try this:

C#

private void button1_Click(object sender, EventArgs e)
{
            PdfDocument pdf = new PdfDocument();
            PdfPage pg = pdf.AddPage();
            XGraphics grp = XGraphics.FromPdfPage(pg);
            grp.MUH = PdfFontEncoding.Unicode;
            grp.MFEH = PdfFontEmbedding.Default;
            XFont ft = new XFont("Microsoft Sans Serif", 15, XFontStyle.Bold);
            grp.DrawString("Hazardous Situation or Incident Record", ft, XBrushes.LightGreen, new XRect(0, 0, pg.Width.Point, pg.Height.Point), XStringFormats.TopCenter);
            string pdffilename = "Hazardous situation(or)Incident Record";
            XPen pn = new XPen(XColors.Blue, 2);
            grp.DrawLine(pn, 2, 80, 612, 80);
            pdf.Save(pdffilename);
            Process.Start(pdffilename);
            //this.Close();
}