防SQL注入攻击

尽可能全的过滤SQL敏感的语句，
先把数据库里面注入的代码替换掉，
再在Global文件里里加入
protected void Application_BeginRequest(Object sender, EventArgs e)
{
//SQL防注入
string Sql_1 = "exec|insert+|select+|delete+|update+|count|chr|mid|master+|truncate|char|declare|drop+|drop+table|creat+|creat+table";
string Sql_2 = "exec+|insert|insert+|delete+|update+|count(|count+|chr+|+mid(|+mid+|+master+|truncate+|char+|+char(|declare+|drop+|creat+|drop+table|creat+table";
string[] sql_c = Sql_1.Split('|');
string[] sql_c1 = Sql_2.Split('|');

if (Request.QueryString != null)
{
foreach (string sl in sql_c)
{
if (Request.QueryString.ToString().ToLower().IndexOf(sl.Trim()) >= 0)
{
Response.Write("警告！你的IP已经被记录!不要使用敏感字符！");//
Response.Write(sl);
Response.Write(Request.QueryString.ToString());
Response.End();
break;
}
}
}

if (Request.Form.Count > 0)
{
string s1 = Request.ServerVariables["SERVER_NAME"].Trim();//服务器名称
if (Request.ServerVariables["HTTP_REFERER"] != null)
{
string s2 = Request.ServerVariables["HTTP_REFERER"].Trim();//http接收的名称
string s3 = "";
if (s1.Length > (s2.Length - 7))
{
s3 = s2.Substring(7);
}
else
{
s3 = s2.Substring(7, s1.Length);
}
if (s3 != s1)
{
Response.Write("警告！你的IP已经被记录!不要使用敏感字符！");//
Response.End();
}
}
}
}