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  string[] monat =  {"Jänner",  
                          "Februar",  
                          "März",  
                          "April",  
                          "Mai",  
                          "Juni",  
                          "Juli",  
                          "August",  
                          "September",  
                          "Oktober",  
                          "November",  
                          "Dezember"};
            for(int i= 0; i<monat.Length; i++)					

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decimal[] umsaetze = new decimal[12];
for(int i= 0; i<monat.Length; i++)
{
   double value;
   do {
      Console.WriteLine("Eingabe des Umsatzes für " + monat[i]);
      string input = Console.ReadLine();
   while( ! decimal.TryParse(input, out value) );
   umsaetze[i] = value;
}