Concatenate two fields and generate an email address - C#

Hello,

I have an asp.net page with a linkbutton. My form has two fields ("fname" and "lname") from which I would like to auto-generate an email address which is populated to the "email" field (example below). If the "fname" or "lname" (or both) is blank when the link button is clicked, an error should be displayed. I am using a code behind file and C#.
<fname> Joe
<lname> Dirt
  [linkbutton]
<email> joe.dirt@nowhere.com

If this is not enough information, please let me know.
LVL 1
austerhausAsked:
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craskinCommented:
did you want this to happen client-side? because for server-side, it's just

FirstNameTextBox.Text + "." + LastNameTextBox.Text + "@nowhere.com"
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austerhausAuthor Commented:
Great! Thanks for your help.
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