How Can String.Format() Be Used to Add Commas to Numbers in .NET?

Formatting Numbers with Commas in .NET using String.Format()

.NET developers often need to format numbers to improve readability, particularly by adding commas as thousands separators. String.Format() offers a straightforward solution for this common formatting task.

The key is using the "n" format specifier:

"{number:n}"

This tells String.Format() to display the number with commas separating thousands, and includes two decimal places by default. Example:

string formattedNumber = String.Format("{0:n}", 1234567); // Output: 1,234,567.00

To control the number of decimal places, append the desired number of zeros:

string formattedNumber = String.Format("{0:n0}", 1234567); // No decimal places. Output: 1,234,567

This simple yet effective method enhances the clarity and presentation of numerical data, especially when dealing with large figures or financial information.

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