How to set a text box for inputing password in winforms?

how to set a text box for inputing password in winforms? Also I want to show "Capslock is ON" popup if capslock is on.

I want something like

<input type="password" /> in HTML.

The best way to solve your problem is to set the UseSystemPasswordChar property to true. Then, the Caps-lock message is shown when the user enters the field and the Caps-Lock is on (at least for Vista and Windows 7).

Another alternative is to set the PasswordChar property to a character value (* for example). This also triggers the automatic Caps-Lock handling.

To set a text box for password input:

textBox1.PasswordChar = '*';

you can also change this property in design time by editing properties of the text box.

To show if "Capslock is ON":

using System;  
using System.Windows.Forms;  
//...
if (Control.IsKeyLocked(Keys.CapsLock)) {  
    MessageBox.Show("The Caps Lock key is ON.");  
}  

To make PasswordChar use the ● character instead:

passwordTextBox.PasswordChar = '\u25CF';

Just set the TextBox.PasswordChar property to '*'.

Just set the property of textbox that is PasswordChar and set the * as a property of textbox. That will work for password.

  passwordtextbox.PasswordChar = '*';

where passwordtextbox is the text box name.