EasyLogger.Info("Arguments: " + args[0].NullIfEmpty() ?? string.Empty + args[2].NullIfEmpty() ?? string.Empty + args[3].NullIfEmpty() ?? string.Empty + args[4].NullIfEmpty() ?? string.Empty);

public static class StringExtensions
{ 
    public static string NullIfEmpty(this string s)
    {
        return string.IsNullOrEmpty(s) ? null : s;
    }
    public static string NullIfWhiteSpace(this string s)
    {
        return string.IsNullOrEmpty(s) ? null : s;
    }
}

// Get first 3 letter from string
char[] array = BarcodeDataTemp.Take(3).ToArray();
// or
string str = BarcodeDataTemp.Substring(0, 5);
// or with error checking
string UIDTemp = null;
if(!string.IsNullOrEmpty(BarcodeDataTemp) && BarcodeDataTemp.Length >= 3)
    UIDTemp = BarcodeDataTemp.Substring(0, 3);

// Split
char[] delimiterChars = { ' ', ',', '.', ':', '\t' };

string text = "one\ttwo three:four,five six seven";
System.Console.WriteLine($"Original text: '{text}'");

string[] words = text.Split(delimiterChars);
System.Console.WriteLine($"{words.Length} words in text:");

foreach (var word in words)
{
    System.Console.WriteLine($"<{word}>");
}


// Split
string somestring = "this is some text that is here!";
somestring.Split(new[] { "some text" }, StringSplitOptions.None)[0]
somestring.Split(new[] { "some text" }, StringSplitOptions.None)[1]

// or
string[] args = arg.Split(',');

substring = str.Split(',')[0];