DemoWebUI/admin/admin_Add.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class admin_adminAdd : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // 下载于www.51aspx.com
        if (Session["admin"] == null)
        {
            Response.Redirect("../default.aspx");
        }
    }
    protected void btnchange_Click(object sender, EventArgs e)
    {
        SqlConnection conn = baseClass.GetCon();
        conn.Open();
        SqlCommand cmd = new SqlCommand("select count(*) from tb_admin where adminID='" + adminNum.Text.Trim() + "'", conn);
        int i =Convert.ToInt32(cmd.ExecuteScalar());
        if (i>0)
        {
            MessageBox.Show("该用户已存在");
            conn.Close();
        }
        else if (adminNum.Text.Trim() == "" || adminName.Text.Trim() == "" || adminPwd.Text.Trim() == "")
        {
            MessageBox.Show("信息不完整！");
        }
        else
        {
            string strsql = "insert into tb_admin(adminID,adminName,adminPwd) values('" + adminNum.Text.Trim() + "','" + adminName.Text.Trim() + "','" + adminPwd.Text.Trim() + "')";
            baseClass.OperateData(strsql);
            Response.Redirect("../admin/admin_manage.aspx");
        }
    }
}