Set extension?

[ant]

I'm making a control. In my code i have this function:

Function openfile(Extension as string,Extension Description as string)
RaiseEvent Isopened
dlg.Filter = "Text Files |*.txt|"
dlg.ShowOpen
RichTextBox1.loadfile dlg.Filename
End Function



How do i make the dialog extension the extension and description that the 2 variables hold?
Ex.
If Extension = *.ccc And Description = "CCC files"


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[Tower]

dlg.Filter = "Text Files |*.txt|CCC files |*.ccc"