Question

I have function where I want display a number in text.

if (all > 120)
{
     int w_m = 120 - il_os;
     string text = "free room: {0}", w_m;
     ModelState.AddModelError("", text);
}

but I have a error:

Error 1 A local variable named ‘w_m’ is already defined in this scope

how display number with text in ModelState.AddModelError?

Answer 1

You’re missing a function there:

string text = string.Format("free room: {0}", w_m);

Placeholders in strings isn’t a language feature! Right now you’re declaring the variable w_m again, as a string. That is a feature:

int a, b, c;