String Formatting in C# to add padding

String formatting with padding in C# allows you to align text in columns by adding spaces to the left or right of strings. This is particularly useful for creating formatted tables, reports, or aligned output displays.

Padding is controlled by format specifiers that define the width and alignment of each placeholder in the format string.

Syntax

The basic syntax for padding in format strings is −

string.Format("{index,width}", value)

Where −

• index − The parameter index (0, 1, 2, etc.)
• width − The total width of the field
• Positive width − Right-aligned (left padding)
• Negative width − Left-aligned (right padding)

Using Left-Aligned Padding

Example

using System;

public class Program {
    public static void Main() {
        // Left-aligned padding using negative width
        const string format = "{0,-10} {1,-15}";
        
        string header = string.Format(format, "Name", "Department");
        string row1 = string.Format(format, "Alice", "Engineering");
        string row2 = string.Format(format, "Bob", "Marketing");
        
        Console.WriteLine(header);
        Console.WriteLine(row1);
        Console.WriteLine(row2);
    }
}

The output of the above code is −

Name       Department     
Alice      Engineering    
Bob        Marketing      

Using Right-Aligned Padding

Example

using System;

public class Program {
    public static void Main() {
        // Right-aligned padding using positive width
        const string format = "{0,8} {1,10:C}";
        
        string header = string.Format("{0,8} {1,10}", "Item", "Price");
        string item1 = string.Format(format, "Apple", 1.50);
        string item2 = string.Format(format, "Banana", 0.75);
        
        Console.WriteLine(header);
        Console.WriteLine(item1);
        Console.WriteLine(item2);
    }
}

The output of the above code is −

    Item      Price
   Apple      $1.50
  Banana      $0.75

Mixed Alignment Table

Example

using System;

public class Program {
    public static void Main() {
        // Mixed alignment: left-aligned names, right-aligned numbers
        const string format = "{0,-8} {1,5} {2,8}";
        
        string header = string.Format(format, "Rank", "Name", "Score");
        string row1 = string.Format(format, "1st", "Tom", "95");
        string row2 = string.Format(format, "2nd", "Sarah", "87");
        string row3 = string.Format(format, "3rd", "Mike", "82");
        
        Console.WriteLine(header);
        Console.WriteLine("------------------------");
        Console.WriteLine(row1);
        Console.WriteLine(row2);
        Console.WriteLine(row3);
    }
}

The output of the above code is −

Rank      Name    Score
------------------------
1st        Tom       95
2nd      Sarah       87
3rd       Mike       82

Comparison of Padding Methods

Conclusion

String formatting with padding in C# uses width specifiers in format strings to align text. Negative widths create left-aligned text with right padding, while positive widths create right-aligned text with left padding. This technique is essential for creating well-formatted tables and aligned console output.