asp.net 表单验证新思路

public static int IntRound(int Max)
{
Random r = new Random();
int i = r.Next(0, Max);
r = null;
return i;
}

int i=IntRound(8);
if (Request.Form["txt" + i] != "")
{
}

if (Request.Form[i] != "")
{
}