为什么我这个登陆系统登录不上

  private void btnLogin_Click(object sender, EventArgs e)
        {
            
                
                try{
                connection.Open();
                string sqlId=string.Format("select userid from mainuser where userid='{0}'and userpwd='{1}'",txtLogin.Text,txtPwd.Text);
                string sqlPwd=string.Format("select userpwd from mainuser where userid='{0}'and userpwd='{1}'",txtLogin.Text,txtPwd.Text);
                SqlCommand id=new SqlCommand(sqlId,connection);
                SqlCommand pwd=new SqlCommand(sqlPwd,connection);
                MessageBox.Show(Convert.ToString(id.ExecuteScalar()),"提示",MessageBoxButtons.OK);
                MessageBox.Show(Convert.ToString(pwd.ExecuteScalar()), "提示", MessageBoxButtons.OK);
                if((txtLogin.Text.GetHashCode()==(Convert.ToString(id.ExecuteScalar())).GetHashCode()) /*&&(txtPwd.Text.Equals(Convert.ToString(pwd.ExecuteScalar())))*/){
                    EditPlayer edit=new EditPlayer();
                    edit.Show();
                    this.Visible=false;
                }
                else{
                    MessageBox.Show("账号或者密码错误");
                }
                }
                catch(Exception ex){
                    MessageBox.Show(ex.Message);
                }
                finally{
                    connection.Close();
                }
        }