窗体会做吧。。做好窗体。。加个Button 再写个Click事件。。click事件里写查询语句就OK了。。如何写连接语句。。自己去看书吧。。写SQL语句要用到两包。。System.Data; 和 System.Data.SqlClient 好像是这两个吧。。我记不得了。。

我也着急啊？楼主知道了吗？

public partial class Login : Form
    {
       
        SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=123456;database=data_base");
        public Login()
        {
            InitializeComponent();
        }

        private void Login_Load(object sender, EventArgs e)
        {
          
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            string name = this.txtName.Text.Trim();
            string pwd = this.txtPwd.Text.Trim();
            if (name == "")
            {
                MessageBox.Show("用户名不能为空！", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
                txtName.Focus();
                return;
            }
            if (pwd == "")
            {
                MessageBox.Show("密码不能为空！", "警告", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
                txtPwd.Focus();
                return;
            }
            if (ValidUser(name, pwd))
            {
                MainForm mainform = new MainForm();
                this.Hide();
                mainform.Show();
            }
            else
            {
                MessageBox.Show("用户名或密码错误！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                txtName.Text = "";
                txtPwd.Text = "";
                txtName.Focus();
                return;
            }
        }

        private bool ValidUser(string Name, string Pwd)
        {
            try
            {

                con.Open();
                string cmd = "Select Count(*) from login Where name='" + Name + "' and password='" + Pwd + "'";
                SqlCommand com = new SqlCommand(cmd, con);
                int n = (int)com.ExecuteScalar();
                if (n == 1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (SqlException ex)
            {
                string Error = ex.ToString();
                return false;
            }
            finally
            {
                con.Close();
            }
        }
    }
}

同样新手，进来学习

我也被这个愁着了，同样是新手，崭新崭新的···