Comparing the textbox size in html using c#

Question

Say for example my sample input file is,

Tag name: input
Attributes:
type="text"
name="hello"
size="49"

Tag name: input
Attributes:
type="text";
name="hello';
size="50";

Now how can i compare the size of the two textboxes... from the Tag name=input and attribute type="text" ....(size=49 && size=50)and results a mismatch result in this case