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System.Data.SqlClient.SqlException in Entity Framework (Web API)

My web controller code:
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Description;
using Account;
namespace Account.Controllers
{
public class ORDER_DETAILController : ApiController
{
private restaurantEntities db = new restaurantEntities();
[HttpGet]
[Route("api/ORDER_DETAIL/PendingOrders/{id}")]
[ResponseType(typeof(ORDER_DETAIL))]
public IQueryable<Orders> PendingOrders(int id)
{
Class1 obj = new Class1();
return obj.GetOrders(id);
}
}
}
Class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using Dapper;
namespace AccountStoredProc.Controllers
{
public class Class1
{
public IQueryable<Orders> GetOrders(int id)
{
using(SqlConnection conn = new SqlConnection("integrated security = true ; data source = RAHUL - PAVILION;"))
{
conn.open();
return conn.Query<Orders>($"select * from ORDER_DETAIL WHERE VEN_ID={id} and ORD_STATUS='PENDING' ").AsQueryable();
}
}
}
}
When I hit the below URL:
https://localhost:44331/api/ORDER_DETAIL/PendingOrders/1
I get this error:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
System.Data.SqlClient.SqlException
I know I already opened the connection while creating EF but how can I execute my query in GetOrders() without a SqlConnection variable called conn I am not able to execute my query without conn variable?
NOTE: connection establishment is working in normal console application and other predefined methods like get, search in account controller but in my predefined method it is not working.

Please check your connection string, especially on spaces
example format for connectiong string:
`connetionString = #"Data Source=WIN-50GP30FGO75; integrated security = true; Initial Catalog=Demodb;User ID=sa;Password=demol23";`

System.Data.OleDb.OleDbException' occurred in System.Data.dll

Hey Members i am new to C# Language and Visual Studio Platform recently i am learning how to connect access Database with visual Studio and first time with same code i have connected with database but after some time when i compiled again then there is error given in Title.
why this is happening ?
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.OleDb;
namespace Clinic_Management_System
{
public partial class Login : Form
{
public Login()
{
InitializeComponent();
}
private void Login_Load(object sender, EventArgs e)
{
try
{
OleDbConnection connection = new OleDbConnection();
connection.ConnectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users
\Hassan Gillani\Documents\Clinic Management System.accdb; Persist Security Info = False; ";
connection.Open();
label1.Text = "Connected to Clinic Management System Database";
connection.Close();
}
catch (Exception exp)
{
MessageBox.Show("Error " + exp);
}
}
}
}
please visit given like to view screen short
http://s33.postimg.org/5ltm4dtnj/Error.png

Using the verbatim character (#) and splitting your path in the middle in not a good idea.
Spaces counts in paths so the filename used for your connection is
C:\Users \Hassan Gillani\Documents\Clinic Management System.accdb;
If you try to use File.Exists on this string you get false as result.
Do not split your connection string in the middle of the path
connection.ConnectionString = #"Provider=Microsoft.ACE.OLEDB.12.0;
Data Source=C:\Users\Hassan Gillani\Documents\Clinic Management System.accdb;
Persist Security Info = False; ";

Unable to connect hosting provider MYSQL database in asp.net

I have MYSQL database from Hosting provider net4.in and i am unable to access database.
My code is as below :
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.Odbc;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class dummy : System.Web.UI.Page
{
OdbcConnection conn;
string Address = "Driver={MySql ODBC 5.1 Driver};Server=phpmyadmin7.net4india.com;Option=3;Port=3306;Stmt=;" +
"DataBase=test;Uid=demo;Pwd=demo123;";
protected void Page_Load(object sender, EventArgs e)
{
string sql = "Select * from test.testing limit 5";
DataSet rsDSet = new DataSet();
try
{
if (sql == "") throw new Exception("SQL input required");
conn = new OdbcConnection(Address);
if (conn.State == ConnectionState.Closed) conn.Open();
OdbcDataAdapter adp = new OdbcDataAdapter(sql, conn);
adp.Fill(rsDSet);
}
catch (Exception ee)
{
Response.Write(ee.ToString());
}
GridView1.DataSource = rsDSet;
GridView1.DataBind();
}
}
Pl let me know how can i connect MYSQL DB.
Thank you in advance

Are you sure your MySQL instance is hosted on a machine named phpmyadmin7? It seems unlikely. Phpmyadmin is the name of a chunk of client software, as I am sure you know.
Are you sure your hosting provider allows access from outside their data center to MySQL server instances? (Presuming you are running the sample code you provided from your own machine, which might not be the case.) Most hosting providers protect their MySQL instances from internet-wide access because it is easy to mount DDOS attacks against them otherwise.
In some hosting provider environments the MySQL authentication scheme only allows access to your MySQL instance from the particular machine upon which your web apps run.
In any case you need to have a conversation with your support crew about how to do this.

How to connect to MySql database on internet web server not on localhost using c#?

i have a web server on internet i am using php/mysql. for my website, now i want to connect to my mysql database on my webserver using my c# windows form application so that i will be able to view,create, update, delete the data on mysql database on webserver, i want to user same database for website and my desktop application. i want any one having my desktop application would be able to update my database on my webserver(i mean not only form some specific ip).
Here is my code when i try to run it shows error "Unable to connect to any of specified MySQL hosts."
can any one Guide me how to do it. Thanks.
The following code is working fine for localhost but not working for web-server which is on internet.
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 MySql.Data.MySqlClient; // for mysql
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string con_str = "SERVER=fdb4.biz.nf;Port=3306;DATABASE=1558711_zee;UID=1558711_zee;PASSWORD=multan321;compress=true;";
MySqlConnection connection = new MySqlConnection(con_str);
try {
connection.Open();
MySqlCommand cmd = connection.CreateCommand();
cmd.CommandText = "SELECT * FROM zeetable";
MySqlDataAdapter mda = new MySqlDataAdapter(cmd);
DataSet mds = new DataSet();
mda.Fill(mds);
dataGridView1.DataSource = mds.Tables[0].DefaultView;
}
catch(MySqlException ex){
MessageBox.Show(ex.Message);
}
}
}
}

How to connect with a database on Access inside a intranet

I have made connection with sql server but i have never done a connection with access and
now this isn't in the computer local, if not it is going to be in a server
users are going to full the form with their information, but the database will be in another computer, how is the connection class to be? and I have never worked in access
how do i for Add, Edit, delete, and queries?
in sql server it was so easy
it was my class connection in sql and i call it since form or another class called DAO
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Windows.Forms;
namespace Proyecto1._0.Conexiones
{
class Conexion
{
public SqlConnection conectar()
{
return new SqlConnection(#"data source=.; integrated security=true; initial catalog=dbmeridajoven;");
}
public bool ejecutarConsulta(string consulta)
{
try
{
SqlCommand comando = new SqlCommand(consulta, this.conectar());
comando.Connection.Open();
comando.ExecuteNonQuery();
comando.Connection.Close();
return true;
}
catch
{
MessageBox.Show("Consulta mal formada");
return false;
}
}
public DataTable regresarTabla(string consulta)
{
try
{
SqlDataAdapter adapter = new SqlDataAdapter(consulta, this.conectar());
DataTable tabla = new DataTable("consulta");
adapter.Fill(tabla);
return tabla;
}
catch
{
MessageBox.Show("Consulta mal formada ");
return new DataTable();
}
}
}
}
I repeat now is with access and it is for intranet (in another computer is the server)

ConnectionStrings.com is a great resource for figuring out how to create a connection string for a variety of database engines. Here's one example of an Access connection string:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\mydatabase.mdb;User Id=admin;Password=;
Once you generate a connection string, you'll notice that the file path is included in the string; to share the database among mulitple clients, you'll need to put the database file on a network share or drive. For example, your file path could be something like "\\dbserver\databases\mydb.mdb."