[英]Asp.net and Sql server
verify user name and password in login page using asp.net with sql server. 使用带有SQL Server的asp.net在登录页面中验证用户名和密码。 But problem is that when i enter the correct data ..go to the error page, not go to the welcom page..
但是问题是,当我在错误页面上输入正确的数据时,而不是在欢迎页面上。
using System;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Configuration;
namespace WebApplication21
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("select * from 'user_insert' where username = @username and password = @password,con");
cmd.Parameters.AddWithValue("@username", TextBox1.Text);
cmd.Parameters.AddWithValue("@password", TextBox2.Text);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count > 0)
{
Response.Redirect("Welcom.aspx");
}
else
{
Response.Redirect("Error.aspx");
}
}
And Connection String in web.config 和web.config中的连接字符串
<connectionStrings>
<add name="dbconnection" connectionString="Data Source=Ali-PC;Initial Catalog=LogIn;Integrated Security=True"/>
</connectionStrings>
Execute the query and you will get the result in your data table use below code instead of yours: 执行查询,您将在数据表中使用以下代码而不是您的代码获得结果:
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand("select * from 'user_insert' where username = @username and password = @password,con");
cmd.Parameters.AddWithValue("@username", TextBox1.Text);
cmd.Parameters.AddWithValue("@password", TextBox2.Text);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
dt.Load(cmd.ExecuteReader());
da.Fill(dt);
You are missing the sql command to execute in your code you are executing 您缺少要执行的代码中要执行的sql命令
SqlDataAdapter da = new SqlDataAdapter(cmd);
but no where you assign any sql command to cmd 但没有在您将任何sql命令分配给cmd的位置
try like this and check the result 像这样尝试并检查结果
SqlCommand cmd = new SqlCommand
(@"select * from 'your table' where username = @username and password = @password",con);
cmd.Parameters.AddWithValue("@username", TextBox1.Text);
cmd.Parameters.AddWithValue("@password", TextBox2.Text);
DataTable dt = new DataTable();
dt.Load(cmd.ExecuteReader());
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