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Código Delphi [-]
 
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
      IF Trim(Edit1.Text)=''THEN
      BEGIN
           IF(Key=#69)OR(Key=#86)THEN //E=69 - V=86 .. Utiliza la propiedad "CharCase" en ecUpperCase
              Exit
           ELSE
              Key:=#0;
      END
      ELSE
      BEGIN
           IF Key = #8 THEN Exit; // Tecla 
           IF (Key<#48)OR(Key > #58) THEN
               Key:=#0;
      END;
end;

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