using System;

​

string[] values = {"12.3","45","def","11","def"};

decimal result = 0;

string resultPalabras = "";

decimal suma = 0;

​

​

for (int i = 0 ; i < values.Length-1; i++){

    if (decimal.TryParse(values[i],out result)){

        suma += result;

    }else{

        Console.WriteLine(values[i]);

    }

}

Console.WriteLine(resultPalabras);

Console.WriteLine(suma);