MVC3 - 3 decimal places on type double with leading zero

Question

I have a field for weight in Kgs (type double or use something else??). In edit view I would like the user to enter numbers to the thousandth place<

Answer 1

To format the number just use

 @string.Format("{0:0.00}", Model.Weight);

or

 @Html.DisplayFor(x => string.Format("{0:0.00}", x.Weight));
 @Html.EditorFor(x => string.Format("{0:0.00}", x.Weight));

to Validate

public class Model
{
    [Required]
    public double Weight{ get; set; }
}

I wouldn't constrain the precision they put in, just make sure that it is a valid number using javascript. You might also constrain input to only include numbers and a period.

If the user puts in something wrong (i.e. not compatible with a double type), MVC will complain when it tries to bind to the model.