The following C# code is used to convert the first character of a string into upper case.

1. static string UppercaseFirst(string s)
2. {
3. // Check for empty string.
4. if (string.IsNullOrEmpty(s))
5. {
6.     return string.Empty;
7. }
8. // Return char and concat substring.
9. return char.ToUpper(s[0]) + s.Substring(1);
10. }