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：
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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;
}
}
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希望本文所述对大家C#程序设计有所帮助。