C# Placeholders in Exceptions

Question

Stupid question but I really can't find the answer of it. How can you insert a place holder in the the exceptions like this? And is it even possible?

  public int Age
{
    get
    {
        return this.age;
    }
    set
    {
        this.age = value;
        if((0 >= value) || (value > 100))
        {


            throw new ArgumentOutOfRangeException("The age {0}  you've entered must be in the range [1..100]",value);
        }
    }
}

Answer 1

You could use string.Format with {0}, {1}...etc. placeholders:

throw new ArgumentOutOfRangeException(string.Format(
    "The age {0} you've entered must be in the range [1..100]", 
    value));

Answer 2

As ArgumentOutOfRangeException expecting a string, you can't pass placeholder to it directly. To construct a string with placeholder you should use string.Format() method. Which gives the formatted string.

string message = string.Format("The age {0}  you've entered must be in the range [1..100]"  ,value);
throw new ArgumentOutOfRangeException( message );