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String Formatting

String.Format​

// {index der variablen die eingesetzt wird:FORMAT}
// C - Currency; U - Universal full date/time
String.Format("{index[,alignment][:formatString]}", object);

string formatted = string.Format("{0:C} {1:U}", 150, thisDate); Console.WriteLine(formatted);
// Ausgabe: 150,00 € Samstag, 8. Februar 2025 18:25:11

string fooFs = string.Format("Check Check, {0} {1}, {0} {1:0.0}", "AB", 23);
Console.WriteLine(fooFs)
// Ausgabe: Check Check, AB 23, AB 23,0

Interpolated String Formatting​

var DateTime thisDate = DateTime.Now;
Console.WriteLine("{0:C} {1:U}", 150, thisDate);

StringBuilder.AppendFormat()​

using System.Text;

decimal num = 34.53567325m; 
var builder = new StringBuilder(); 
builder.AppendFormat("Format Decimal: {0:n2}", num);

String Interpolation​

var DateTime thisDate = DateTime.Now;
Console.WriteLine($"{150:C} {thisDate:U}");

Format a Table structure​

string headers = $"{"First Name", -20}{"Last Name", -20}{"Value", -20}{"Time", -20}";
string line	= $"{"Luiz", -20}{"Parente", -20}{20, -20:C}{DateTime.Now, -20:d}";

Console.WriteLine(headers);
Console.WriteLine(line);

/*
This code example produces the following results:

First Name           Last Name            Value                Time             
Luiz                 Parente              $20.00               2/9/2020   
*/

String Formatting CheatSheet (Github)
C# String Format Examples