PDF417 MaxRow

Either set height property in codebehind .cs file

BCSBarcodeCtrl1.PDF417MaxRow = 0;

Or add a tag directly

< img src="barcodesoft.ashx?s=pdf417&pmr=2

< img src="barcodesoft.ashx?s=pdf417&pmr=3

int PDF417MaxRow

Default value of PDF417MaxRow property is 0 (Auto-select).
You can set it to a value to maximum row.

You can also setup PDF417MaxRow property through URL by setting "pmr":
<img src="Barcodesoft.ashx?s=pdf417&TEXT=1234&pmr=2>