CODEWITHSUNDEEP
vb.netwinforms
user9945420
user9945420

Reputation:

How to unmask a password textbox?

I would like to toggle the password visibility of a textbox with a checkbox element. So whenever the state changes I would like to display the password with password characters or plain text.

Using C# I can simply assign a password character for asterisks via

textBox.PasswordChar = '*';

and for plain text

textBox.PasswordChar = '\0';

With VB I currently have this sample code

Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
    If CheckBox1.Checked Then
        TextBox1.PasswordChar = '\0'
        CheckBox1.Text = "Hide password"
    Else
        TextBox1.PasswordChar = '*'
        CheckBox1.Text = "Show password"
    End If
End Sub

and found some information here

How do you declare a Char literal in Visual Basic .NET?

I know that ' is considered as a comment so I have to use double-quotes. I can update '*' to "*"C but what's the equivalent for '\0'?

What is the correct way to unmask the textbox password?

Upvotes: 1

Views: 1568

Answers (1)

41686d6564
41686d6564

Reputation: 19641

You may use the Nothing keyword which will set the default value for the expected type (Char in this case):

Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
    TextBox1.PasswordChar = If(CheckBox1.Checked, Nothing, "*"c)
End Sub

A better way would be to use the UseSystemPasswordChar property instead of PasswordChar. This makes the password mask look "more standard". That's, of course, unless you want to use a custom char. Here's an example:

Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
    TextBox1.UseSystemPasswordChar = Not CheckBox1.Checked
End Sub

Upvotes: 2

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