Set the position of a text or an image in a pdf using itextsharp(C#/asp.net)

If you tried img.SetAbsolutePosition(10000f,10000f); then your image is way out of the visible area of the PDF. You are creating your Document like this:

Document document = new Document(PageSize.A4, 188f, 88f, 5f, 10f);

This means that the size of the page is 595 x 842 user units. Using x = 10000 and y = 10000 doesn't fit inside a rectangle of 595 x 842.

Please try:

img.SetAbsolutePosition(0,0);

When you use these coordinates, the lower-left corner of the image will coincide with the lower-left corner of the page.

Please consult the official iText documentation and search for coordinate system. See for instance:

• How should I interpret the coordinates of a rectangle in PDF?
• Where is the origin (x,y) of a PDF page?
• ...

This will help you find how to define the coordinates for the SetAbsolutePosition() method.

Update:

You are also asking about adding text at absolute positions. Here we have to make the distinction between a single line of text and a block of text. See also the section Absolute positioning of text on the official web site.

A single line of text:

See for instance How to position text relative to page? and you'll find the showTextAligned() method:

ColumnText.showTextAligned(canvas, Element.ALIGN_CENTER,
    new Phrase("Some text"), 100, 100, 0);

Please make sure that you read other examples to so that you discover what the canvas object is about.

A block of text:

Take a look at How to add text inside a rectangle?

ColumnText ct = new ColumnText(cb);
ct.SetSimpleColumn(rect);
ct.AddElement(new Paragraph("This is the text added in the rectangle"));
ct.Go();

Please take a look at the full example to find out what cb and rect are about.