Merging 2 text box

I have set the following
FName as string * 20
LName as string * 20
FLName as string *40
in my form I have text1 as txtFirstName
text2 as txtLastName.
what I am tring to do as a project to use in other progams is have text3 = txtFirstLastName show text1 and text2

VB Code:

txtFirstLastName.Text = txtFirstName.Text & " " & txtLastName.Text

Code:

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Text3 = Text1 & " " & Text2

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Yea, its just algebra...except w/ some "&" signs.