A family of Microsoft relational database management systems designed for ease of use.
That merely formats the value, it does not change it to upper case. To convert input to upper case put the following in the control's KeyPress event procedure:
Dim strCharacter As String
' Convert ANSI value to character string.
strCharacter = Chr(KeyAscii)
' Convert character to upper case, then to ANSI value.
KeyAscii = Asc(UCase(strCharacter))
Data input must be via a form of course, which should in any case always be so, never in a table's or query's datasheet.