Usage of StringLengthAttribute ErrorMessage

Hello,

I'm trying to figure out the format of StringLengthAttribute.ErrorMessage. What are the parameters passed when formatting this string? Let's say I want to show a message like this (for password validation):

[StringLength(100, ErrorMessage = "The password must be at least {0} characters", MinimumLength = 6)]

Would it format correctly? Here's an example I don't understand:

http://mvcmusicstore.codeplex.com/S...c5263ed#MvcMusicStore/Models/AccountModels.cs

It looks like this:

[Required]
        [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
        [DataType(DataType.Password)]
        [Display(Name = "New password")]
        public string NewPassword { get; set; }

Code (markup):

What is {0} and {1}? Where do I read up on this information?