本文实例讲述了C#找出字符串中第一个字母并大写的方法。分享给大家供大家参考，具体如下：

class Program { static void Main(string[] args) { String aa = "%.,46,2xb1bfs.,,"; int pos = isLetter(aa); aa = aa.Substring(pos, 1); Console.WriteLine(aa.ToUpper()); Console.Read(); } public static int isLetter(string validString) { byte[] tempbyte = System.Text.Encoding.Default.GetBytes(validString); int pos = 0; for (int i = 0; i < validString.Length; i++) { byte by = tempbyte[i]; if ((by >= 65) && (by <= 90) || ((by >= 97) && (by <= 122))) { break; } pos++; } return pos; } }

希望本文所述对大家C#程序设计有所帮助。