在CSDN上献丑一回，希望能帮助一些对初学习VB的朋友们。

首先我们先来看一个例子，我想这个问题就不难理解了！

’代码开始——————————————————————————————————————————

Private Sub Command1_Click()
If Text2.Text <> "" And Text4.Text <> "" Then
MsgBox "密码正确！欢迎使用。",64,"提示"
Unload Me
Else
MsgBox "用户名或密码不正确！请重新输入。",vbCritical,"错误"
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Text4.Text = ""
Exit Sub
End If
End Sub
Private Sub Command2_Click()
End
End Sub
Private Sub Form_Load()
Form1.Caption = "text的passwordChar属性对比"
Frame1.Caption = "passwordChar属性未设置"
Frame2.Caption = "passwordChar属性设置未*"
Command1.Caption = "登陆"
Command2.Caption = "退出"
Label1.Caption = "用户名"
Label2.Caption = "密码"
Text1.Text = "admin"
Text2.Text = ""
Text2.PasswordChar = ""
Label3.Caption = "用户名"
Label4.Caption = "密码"
Text3.Text = "admin"
Text4.Text = ""
Text4.PasswordChar = "*"
End Sub

'这里我们以 用户名：admin 登陆密码：123456 为例子进行演示！

———————————————————————————————————————————————

注：以上代码在xp下测试通过！

_______________________________________________________________________