Capitalize

Capitalizes the first letter of a string.

Use string.ToCharArray() to convert the string to an array of char, chars.
Use char.ToUpper(chars[0]) to capitalize the first letter.
Finally, return a new string() from the chars array.

public static partial class _30s 
{
  public static string Capitalize(string str) 
  {
    char[] chars = str.ToCharArray();
    chars[0] = char.ToUpper(chars[0]);
    return new string(chars);
  }
}

string s = "fooBar";

_30s.Capitalize(s); // "FooBar"

Last updated 15 September 2026 · Edit this page