asp.net使用参数（parameters）的方法执行数据库操作例子

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Data.SqlClient;using System.Data;public partial class ADO_SqlParameter : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        SqlConnection conn = new SqlConnection();        SqlCommand cmd = new SqlCommand();        string sqlText = "";        sqlText = "select count(*) from tbAdmin where adminName=@adminName and adminPwd=@adminPwd";        conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ADO"].ToString();        cmd.Connection = conn;        cmd.CommandText = sqlText;        cmd.Parameters.Add(new SqlParameter("@adminName",SqlDbType.VarChar,50));        cmd.Parameters.Add(new SqlParameter("@adminPwd",SqlDbType.VarChar,50));        cmd.Parameters["@adminName"].Value = "admin";        cmd.Parameters["@adminPwd"].Value = "admin";        conn.Open();        int count = int.Parse(cmd.ExecuteScalar().ToString()) ;        Response.Write(count);        conn.Close();    }}