im new to C# and trying to connect a windows form to a mySQL database.
The problem is i get the error below and can't find a way to fix this.
Error CS0120 An object reference is required for the non-static field, method, or property 'Login.con()
This is the Form.cs
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Log
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void BtnConnect_Click(object sender, EventArgs e)
{
Login.con();
}
}
}
This is the Login.cs file where the connections should be made.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using System.Windows.Forms;
using MySql.Data;
using System.Data;
namespace Log
{
public class Login
{
public MySqlConnection connection;
private string server;
private string database;
private string user;
private string password;
private string port;
private string connectionString;
private string sslM;
public Login()
{
server = "localhost";
database = "test";
user = "root";
password = "root";
port = "3306";
sslM = "none";
connectionString = String.Format("server={0};port={1};user id={2}; password={3}; database={4}; SslMode={5}", server, port, user, password, database, sslM);
connection = new MySqlConnection(connectionString);
}
public void con()
{
try
{
connection.Open();
MessageBox.Show("successful connection");
connection.Close();
}
catch (MySqlException ex)
{
MessageBox.Show(ex.Message + connectionString);
}
}
}
}
you need to instance Login class...
Login login = new Login();
login.con()
You have to create a new instance of class Login. Try like:
public void BtnConnect_Click(object sender, EventArgs e)
{
Login login = new Login();
login.con();
}
Related
Hi so I'm creating a simple C# Winform application that will let users login to facebook. So far, when I run the program, a message "The parameter app_id is required". In my code below, I have added my app_id but it is still not working. How can I fix this? On the designer portion of the form, I just added the WebBrowser on the form. Nothing too fancy. The code for this form is below. Thanks.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using Facebook;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Dynamic;
namespace demo
{
public partial class Form1 : Form
{
private const string AppId = "{APP_ID}";
private Uri _loginUrl;
private const string _ExtendedPermissions = "user_about_me,publish_stream,offline_access";
FacebookClient fbClient = new FacebookClient();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Login();
}
private void Login()
{
dynamic parameters = fbClient.Get("oauth/access_token", new
{
client_id = "{APP_ID}",
client_secret = "{SECRET_KEY}",
grant_type = "client_credentials"
});
if (!string.IsNullOrWhiteSpace(_ExtendedPermissions))
parameters.scope = _ExtendedPermissions;
var fb = new FacebookClient();
_loginUrl = fb.GetLoginUrl(parameters);
webBrowserLogin.Navigate(_loginUrl.AbsoluteUri);
}
}
}
I have to retrieve the SID of a C# software in order to connect it with Facebook.
I saw that I have to print this:
string sid=WebAuthenticationBroker.GetCurrentApplicationCallbackUri().ToString();
But it's written that WebAuthenticationBroker doesn't exist in the context.
So I added using Windows.Security.Authentication.Web; but it still doesn't work.
Do you have some solutions ?
Here is my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Facebook;
using System.Net;
using System.Web;
using System.Dynamic;
using Windows;
using Windows.Security.Authentication.Web;
namespace testfb
{
public partial class Form1 : Form
{
private const string AppId = "APPID";
private Uri _loginUrl;
private const string _ExtendedPermissions = "user_about_me, publish_stream, offline_access";
FacebookClient fbClient = new FacebookClient();
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
string sid = WebAuthenticationBroker.GetCurrentApplicationCallbackUri().ToString();
Login();
}
public void Login()
{
dynamic parameters = new ExpandoObject();
parameters.client_id = AppId;
parameters.redirect_uri = "https://www.facebook.com/connect/login_success.html";
parameters.response_type = "token";
parameters.display = "popup";
if (!string.IsNullOrWhiteSpace(_ExtendedPermissions))
parameters.scope = _ExtendedPermissions;
var fb = new FacebookClient();
_loginUrl = fb.GetLoginUrl(parameters);
webBrowser2.Navigate(_loginUrl.AbsoluteUri);
}
}
}
I am trying to use .net connect to SQL EXPRESS database. I also get error Cannot open database "binarystream" requested by the login. The login failed.
but my dataconnect already show I connected to databaseenter
here is my C# code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection dee= new SqlConnection("Data Source=(local)\SQLEXPRESS;Initial Catalog=binarystream;Integrated Security=True");
SqlDataAdapter da = new SqlDataAdapter();
da.InsertCommand = new SqlCommand("INSERT INTO CUSTOMER VALUES(#USERNAME,#PASSWORD)",dee);
da.InsertCommand.Parameters.Add("#username", SqlDbType.VarChar).Value = textBox1;
da.InsertCommand.Parameters.Add("#password", SqlDbType.VarChar).Value = textBox2;
dee.Open();
da.InsertCommand.ExecuteNonQuery();
dee.Close();
}
}
}
This Form 1
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;
using Managed.Adb;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
AndroidDebugBridge mADB;
String mAdbPath;
List<Device> devices = AdbHelper.Instance.GetDevices(AndroidDebugBridge.SocketAddress);
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e )
{
//mAdbPath = Environment.GetEnvironmentVariable("PATH");
mAdbPath = "C:\\Users\\Nadun\\AppData\\Local\\Android\\android-sdk\\platform-tools";
mADB = AndroidDebugBridge.CreateBridge(mAdbPath + "\\adb.exe", true);
mADB.Start();
var list = mADB.Devices;
textBox1.Text = "" + list.Count;
foreach (Device item in list)
{
Console.WriteLine("");
listBox1.Items.Add("" + item.Properties["ro.build.product"].ToString() + "-" + item.SerialNumber.ToString() );
}
//Console.WriteLine("" + list.Count);
}
private void button2_Click(object sender, EventArgs e)
{
string text = listBox1.GetItemText(listBox1.SelectedItem);
Form2 f2 = new Form2(text);
// f2.Phone = "scs";
SetPhone sp = new SetPhone();
sp.PhoneModel = "Test";
this.Visible = false;
f2.ShowDialog();
}
}
}
This is Form 2
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
private string phone;
public string Phone
{
get { return this.phone; }
set { this.phone = value; }
}
public Form2(string a)
{
InitializeComponent();
textBox1.Text = a;
}
private void Form2_Load(object sender, EventArgs e)
{
//Form2 f2 = new Form2();
//f2.phone = "s";
//textBox1.Text = f2.Phone;
SetPhone sp = new SetPhone();
textBox1.Text = sp.PhoneModel;
Console.WriteLine("sefsef-"+sp.PhoneModel);
}
}
}
This is my Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WindowsFormsApplication1
{
class SetPhone
{
private string phoneModel;
public string PhoneModel {
get { return this.phoneModel; }
set { this.phoneModel = value; }
}
}
}
Get always returning empty.i don't know why.
I am trying to set values from "form1".
i wrote class for that as well.but when i getting values from "form2" it returning empty.i don't know why
Your SetPhone class object which is calling the setter in the button2_click is a local variable, so when you try access the same in Form2_Load using another local variable, it is a completely new object and Get returns an empty string (default value). You should be able to share the SetPhone variable across forms, may be using constructor, then it will retain the values set using the setter
Basically what I'm trying to do is I have a string on the main form that pulls its value from a textbox.
I then generate a modal version of a second form and want to have that string (or the main forms textbox1.text value) usable in the second form for processes.
Main Form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.IO;
namespace Tool{
public partial class MainForm : Form
{
public string hostname;
public MainForm()
{
InitializeComponent();
textBox1.Text = hostname;
}
public void btn_test_Click(object sender, EventArgs e)
{
string hostname = textBox1.Text;
SiteForm frmsite = new SiteForm();
frmsite.ShowDialog();
}
}
}
'
Child Form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.IO;
namespace Tool
{
public partial class SiteForm : Form
{
public string hostname {get; set; }
public SiteForm()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
label1.Text = this.hostname;
}
}
}
Any suggestions on how I can do this? I know there has to be a simpler way, sorry I'm still a bit of a noob and am trying to teach myself C# as I go.
The result is when I click the label on the child form it is blank, because of this I am able to deduce that the string isn't passing between the two forms correctly.
The simplest way is to pass it in the constructor of the Child form, for example:
private string _hostname = "";
...
public SiteForm(string hostname)
{
_hostname = hostname;
InitializeComponent();
}
Try hooking into your child form's Load event and set the value of its hostname property in an event handler on your main form.
public void btn_test_Click(object sender, EventArgs e)
{
string hostname = textBox1.Text;
SiteForm frmsite = new SiteForm();
frmsite.Load += new EventHandler(frmsite_Load);
frmsite.ShowDialog();
}
public void frmsite_Load(object sender, EventArgs e)
{
SiteForm frmsite = sender as SiteForm;
frmsite.hostname = this.hostname;
}