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string strCmd = "SELECT AccountID FROM Account WHERE AccountName=@AccountName AND password=@password";
对于SQL Server数据库，“@”是参数的前缀。上句中定义了两个参数：@AccountName，@password。
SqlCommand cmd = new SqlCommand(strCmd, conn);
cmd.Parameters.AddWithValue("@AccountName", userName);
cmd.Parameters.AddWithValue("@password", password);
cmd.ExecuteReader();
代码示例：
1 static void Main(string[] args)
2 {
3 string userName = "Joe";
4 string password = "123456";
5
6 string strConn = @"server=Joe-PC;database=AccountDBforSQLInjection;uid=sa;pwd=root";
7 SqlConnection conn = new SqlConnection(strConn);
8
9 string strCmd = "SELECT AccountID FROM Account WHERE AccountName=@AccountName AND password=@password";
10 SqlCommand cmd = new SqlCommand(strCmd, conn);
11
12 cmd.Parameters.AddWithValue("@AccountName", userName);
13 cmd.Parameters.AddWithValue("@password", password);
14
15 try
16 {
17 conn.Open();
18 SqlDataReader dr = cmd.ExecuteReader();
19 if (dr.Read())
20 {
21 Console.WriteLine("成功");
22 }
23 else
24 {
25 Console.WriteLine("失败");
26 }
27 }
28 catch (Exception e)
29 {
30 Console.WriteLine(e);
31 }
32 finally
33 {
34 conn.Close();
35 }
36 }
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原文地址：http://www.cnblogs.com/beijingstruggle/p/5832565.html
