vb实验怎么写都不对

怎么将输入字符大写转小写，小写转大写，且每输入一个字符能立马显现

 keypress里面写
if (KeyAscii >= 65 And KeyAscii <= 90) Then MsgBox LCase(Chr(KeyAscii)) else MsgBox UCase(Chr(KeyAscii))