C# program to get max occurred character in a String

 public static void Main()  
     {  
       string str;  
       int[] ch_fre = new int[255];  
       int i = 0, max, l;  
       int ascii;  
       Console.Write("\n\nFind maximum occurring character in a string :\n");  
       Console.Write("--------------------------------------------------\n");  
       Console.Write("Input the string : ");  
       str = Console.ReadLine();  
       l = str.Length;  
       for (i = 0; i < 255; i++) //Set frequency of all characters to 0  
       {  
         ch_fre[i] = 0;  
       }  
       /* Read for frequency of each characters */  
       i = 0;  
       while (i < l)  
       {  
         ascii = (int)str[i];  
         ch_fre[ascii] += 1;  
         i++;  
       }  
       // Console.Write("{0} ",(char)65);  
       max = 0;  
       for (i = 0; i < 255; i++)  
       {  
         if (i != 32)  
         {  
           if (ch_fre[i] > ch_fre[max])  
             max = i;  
         }  
       }  
       Console.Write("The Highest frequency of character '{0}' is appearing for number of times : {1} \n\n", (char)max, ch_fre[max]);  
       Console.ReadLine();  
     }