Password field as Passwordchar in Datagridview in WINFORM

// Create an instance of the TextBox control.
    TextBox textBox1 = new TextBox();
    // Set the maximum length of text in the control to eight.
    textBox1.MaxLength = 8;
    // Assign the asterisk to be the password character.
    textBox1.PasswordChar = '*';
    // Change all text entered to be lowercase.
    textBox1.CharacterCasing = CharacterCasing.Lower;
    // Align the text in the center of the TextBox control.
    textBox1.TextAlign = HorizontalAlignment.Center;

https://msdn.microsoft.com/en-us/library/aa983584(v=vs.71).aspx

https://msdn.microsoft.com/en-us/library/system.windows.forms.textbox.passwordchar(v=vs.110).aspx

Hope this will help you.

thanks