useful nippets C# for beginners

how to comment code
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comment = Ctrl+K, Ctrl+C
uncomment = Ctrl+K, Ctrl+U
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how to convert to decimal with .00
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Console.WriteLine("{0:0.00 leva}", demo); //this
Console.WriteLine("{0:F2} levs", demo); // or that
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how to split a string into list of nums/words
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string input = Console.ReadLine();
List<string> listIt = input.Split(' ').ToList();
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CREATE NEW STRING FOR THE LOOP (Problem number 4 from

exams)
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string stars = new string('*', 10);
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split string into characters
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char[] characters = "this is a test".ToCharArray();
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how to remove white space and lower all letters
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string newText = text.ToLower().Replace(" ", string.Empty);
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how to split number into individual digits
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string inputLine = Console.ReadLine();
inputLine = inputLine + " " + int.MaxValue;
string[] inputTokens = inputLine.Split(' ');
   for (int i = 0; i < inputTokens.Length; i++)
            {
                int num = int.Parse(inputTokens[i]);
            }
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sum the number for example 1254 (working with 4 digits)
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int n = int.Parse(Console.ReadLine());
int nSum = 0;
while (n >; 0)
{
    nSum += n % 10;
    n /= 10;
}
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how to compare time in c#
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TimeSpan time = TimeSpan.Parse(Console.ReadLine());
TimeSpan start = new TimeSpan(14, 0, 0);
TimeSpan end = new TimeSpan(18, 59, 0);
if ((time > start) && (time < end))
{
     Console.WriteLine("match found");
}
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how to create new empty string and append char/s to it
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var string = new StringBuilder();
string.Append(character[i]);
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convert StringBuilder to String
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string newString = oldString.ToString();
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subtract string with the function
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string leftFirstStr = "test".Substring(0, firstIndex);

//outputs: "est"
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how to convert char into ASCII (int)
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int ascii = (int)Convert.ToChar(item)
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how to convert int into hex
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int.ToString("X"); //IMPORTANT "X" HAVE TO STAY, DONT

CHANGE IT
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find all possible combinations of a string
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string alphabet = Console.ReadLine();
int n = int.Parse(Console.ReadLine());

var q = alphabet.Select(x =>; x.ToString());
int size = 5; //enter the length of the string...
for (int i = 0; i < size - 1; i++)
{
    q = q.SelectMany(x =>; alphabet, (x, y) =>; x + y);
}
foreach (var item in q)
{
    Console.WriteLine(item);
}
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Create new list
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List<int> decimalArray = new List<int>();
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TIPS:
using arrays/string in a loop = constant.Length
using list in a loop = constant.Count