Modifying a Specific Line in a Multiline Textbox

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VB

selection

Hello,

I simply want to want to use a loop to check the beginning of each line in a multiline textbox for a number, but cannot figure out which method I need to use to do this. All I need to know is what to use to select one line in the textbox, then loop to the next line down, etc. I thought there would be something like:

Textbox1.Line(i)

but obviously not!
Any ideas?

Nathan