Excel Automation command pRange->Item

Hello,

I am building an excel automation and i have a problem when the user put information in a textbox to select columns.

I am getting the string from the textbox and adding it to this command :

pRange->Item[TBtext1][TBtext2]

If i only use one textbox string to the frist[] and add a fixed value to the second one it works:

pRange->Item[TBtext1][1]

How can i fix that, so i can use the data from TBtext1 and TBtext2?

Thanks