IsUpper

Checks if a string is upper case.

• Convert the given string to upper case, using string.ToUpper() and compare it to the original.

public static partial class _30s 
{
  public static bool IsUpper(string str) 
  {
    return str.ToUpper() == str;
  }
}

string s1 = "ABC";
string s2 = "cDe";

_30s.IsUpper(s1); // true
_30s.IsUpper(s2); // false