I have a textbox in a c# windows form i am having problems in assigning a null values to a PasswordChar. What i want to do is that if a checkbox is checked then the PasswordChar should be null i.e the actual text should be displayed else the PasswordChar should be *. This what i have tried

    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        if (!checkBox1.Checked)
        {
            txtPassword.PasswordChar = '*';
        }
        else
        {
            txtPassword.PasswordChar = '';
        }
    }

but this line 

     txtPassword.PasswordChar = '';

is generating an error. I have even tried

     txtPassword.PasswordChar = null;

but i still get an error.

Please help me correct my code.

c# winforms textbox
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