Question

If I have the following:

[Range(0,120)]
public int QtyOnHand { get; set; }

How can I add an error message to say the required range?

Answer 1

The RangeAttribute has an ErrorMessage that you can set:

[Range (0, 120, ErrorMessage = "Quantity on hand must be between {1} and {2}.")]
public int QtyOnHand { get; set; }

By using {1} and {2}, you don’t have to keep changing the string when your numbers change. {0} is for the name of the field. This can be accompanied with the DisplayNameAttribute as such:

[DisplayName ("Quantity on Hand")]
[Range (0, 120, ErrorMessage = "{0} must be between {1} and {2}.")]
public int QtyOnHand { get; set; }