简单三层实现登陆

Model层

[Serializable]

public partial class tb_admin

{ public tb_admin()

{}

#region Model private string _id;

private string _name; private string _pwd;

/// <summary>

///

/// </summary>

public string id { set{ _id=value;} get{return _id;} }

/// <summary>

///

/// </summary>

public string name { set{ _name=value;} get{return _name;} }

/// <summary>

///

/// </summary>

public string pwd { set{ _pwd=value;} get{return _pwd;} }

#endregion Model

}

DAL层

public class AdminServer {

public List<tb_admin> Tabletb_Admin( string name,string pwd) {

List<tb_admin> list = new List<tb_admin>();

string str = "select* from tb_admin where name='" + name + "'and pwd='" + pwd + "'";

DataTable table= DBHelper.GetDataTable(str);

if (table.Rows.Count>0)

{

foreach (DataRow item in table.Rows)

{

list.Add(DataRowToModel(item));

}

}

return list; }

/// <summary>

/// 得到一个对象实体

/// </summary>

public tb_admin DataRowToModel(DataRow row)

{

tb_admin model = new tb_admin();

if (row != null)

{

if (row["id"] != null)

{

model.id = row["id"].ToString();

}

if (row["name"] != null)

{

model.name = row["name"].ToString();

}

if (row["pwd"] != null)

{

model.pwd = row["pwd"].ToString();

}

}

return model;

}

BLL层

public static class AdminBLL
{
static AdminServer Admin=new AdminServer();
public static List<tb_admin> Tabletb_Admin( string name, string pwd)
{
return Admin.Tabletb_Admin(name,pwd);
}
}

UI层

protected void Button1_Click(object sender, EventArgs e)

{

string name = TextBox1.Text;

string pwd = TextBox2.Text;

string str=Convert.ToString(Session["code"]);

if (name=="")

{

Label2.Visible = true;

Label2.Text="用户名为空";

}

else if (pwd =="")

{

Label2.Visible = true;

Label2.Text = "密码名为空";

}

else

{

List<tb_admin> damin = AdminBLL.Tabletb_Admin(name, pwd);

if (damin.Count > 0)

{

if (TextBox3.Text == str)

{

Response.Redirect("TushuXinxiGuanl.aspx");

}

else

{

Label1.Visible = true;

Label1.Text = "验证码错误！";

}

}

}

}