C# 生成编号的方法

string str = "";
string code = "";
//取出需要编号列的最大值
string sqlstring = "select MAX(BH) from dbo.adminuser";
//调用sql操作的公共类
DataTable tbs = db.GetTable(sqlstring);
str = Convert.ToString(tbs.Rows[0][0]);

if(str !=null && str!="")
{
//从第二位后截取字符
string tmp = str.Substring(2);
//截取前两个字符
string bb = str.Substring(0, 2);
for(int i =1;i<=1;i++)
{
string num = Convert.ToString(Convert.ToInt32(tmp) + i);
//详情见同目录 PadLeft,填充
num = num.PadLeft(3, '0');

code = bb + num;
}
}
else
{
code = "BH001";
}