PDF417 Security Level

Either set height property in codebehind .cs file

BCSBarcodeCtrl1.PDF417SecurityLevel = 0;

Or add a tag directly

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

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

int PDF417SecurityLevel

Default value of PDF417SecurityLevel property is 0 (Auto-select).
You can set it to a value between 1 and 9.
Other value will be reset to its default value 0.

You can also setup PDF417SecurityLevel property through URL by setting "psl":
<img src="Barcodesoft.ashx?s=pdf417&TEXT=1234&psl=2>