SQL查询意外返回值

[thinker56]

			DataTable dt = new DataTable();
			Con2.Open();
			Cmd2.CommandText = "SELECT Age FROM Persons WHERE Name='?'";
			//Apt2.Fill(dt);
			Cmd2.Parameters.Add("@Name", SqlDbType.NChar, 10);
			Cmd2.Parameters[0].Value = "Gates";
			SqlDataReader rdr = Cmd2.ExecuteReader();
			Console.WriteLine(rdr.Read());
			Console.WriteLine(Cmd2.Parameters[0].ParameterName);
			Console.WriteLine(Cmd2.Parameters[0].Value);
			Con2.Close();

Sql Server数据库连接，为什么执行结果rdr.Read()==false

表结构如下：

[烟灰洒落键盘]

SELECT Age FROM Persons WHERE Name='?' => SELECT Age FROM Persons WHERE Name=@Name

[phommy]

你是想写Name=@Name吧？