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Rename a Windows Computer / Server with C# WPF

I am trying to create a Configuration Tool for new devices, which has to be set up.
That's why I am trying to set the local hostname with a Button.
I want to use the name which I wrote in a textbox
public void SetMachineName(string newName)
{
// Create a new process
ProcessStartInfo process = new ProcessStartInfo();
// set name of process to "WMIC.exe"
process.FileName = "WMIC.exe";
// pass rename PC command as argument
process.Arguments = "computersystem where caption='" + System.Environment.MachineName + "' rename " + newName;
// Run the external process & wait for it to finish
using (Process proc = Process.Start(process))
{
proc.WaitForExit();
// print the status of command
Console.WriteLine("Exit code = " + proc.ExitCode);
}
}
public void Click_sethostname(object sender, RoutedEventArgs e)
{
SetMachineName(Textbox_sethostname.Text);
}
WPF setup
I have following namespaces:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Threading;
using Microsoft.Win32;
using System.Management;
using System.Diagnostics;

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";`

The name 'TextBox1' does not exist in the current context(usually)

I am currently developing a website by visual studio c# language and right now I am working on the user password reset page design. The problem I met is that I want to add the control to the textboxes and labels by using basic textbox.text = ""; method. But it keeps telling me it did not exist. I have searched a lot of solutions I am sure that:
1, It is the same name between the label name and the coding name.
2, There were no other same name pages since I was re-created another page with different names.
3, All these are added:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Net.Mail;
using System.Drawing;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.Text;
using System.IO;
Can anyone help? I confused here for a few days already:)
protected void SubmitButton_Click(object sender, EventArgs e)
{
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlCommand cmd = new SqlCommand("spResetPassword", con);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter paramUsername = new SqlParameter("#UserName", userTextBox.text);
cmd.Parameters.Add(paramUsername);
con.Open();
SqlDataReader rdr = cmd.ExecuteReader();
while (rdr.Read())
{
if (Convert.ToBoolean(rdr["ReaturnCode"]))
{
SendPasswordResetEmail(rdr["Email"].ToString(), TextBox1.Text, rdr["UniqueId"].ToString());
msgLabel.Text = "An reset password Email has sent to your Email address.";
}
else
{
msgLabel.Text = "username not found!";
}
}
}

Does your textbox control have the following attribute?
runat="server"

ManagementEventWatcher.Start() Access Denied

I'm trying to create an application in C#.Net, and I need it to scan the processes that the user start and stop, but I'm getting an "Access Denied" on the .Start()
Here is what I've got so far
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Management;
using Security;
using MySQLConnectivity;
namespace MyApp
{
public partial class Login : Form
{
MySQLClass sql = new MySQLClass();
ManagementEventWatcher processStartEvent = new ManagementEventWatcher("SELECT * FROM Win32_ProcessStartTrace");
ManagementEventWatcher processStopEvent = new ManagementEventWatcher("SELECT * FROM Win32_ProcessStopTrace");
public Login()
{
InitializeComponent();
processStartEvent.EventArrived += new EventArrivedEventHandler(processStartEvent_EventArrived);
processStartEvent.Start();
processStopEvent.EventArrived += new EventArrivedEventHandler(processStopEvent_EventArrived);
processStopEvent.Start();
}
void processStartEvent_EventArrived(object sender, EventArrivedEventArgs e)
{
string processName = e.NewEvent.Properties["ProcessName"].Value.ToString();
string processID = Convert.ToInt32(e.NewEvent.Properties["ProcessID"].Value).ToString();
MessageBox.Show("Process started. Name: " + processName + " | ID: " + processID);
}
void processStopEvent_EventArrived(object sender, EventArrivedEventArgs e)
{
string processName = e.NewEvent.Properties["ProcessName"].Value.ToString();
string processID = Convert.ToInt32(e.NewEvent.Properties["ProcessID"].Value).ToString();
MessageBox.Show("Process stopped. Name: " + processName + " | ID: " + processID);
}
}
}
I've searched online hours, but couldn't find anything. People that had this problem, had it remotelly, and not locally. I am using Windows Pro 8.1 + Microsoft Visual Studio Ultimate 2013, just in case that versions of VS or OS may be important in this case.
The problem triggers on processStartEvent.Start() saying "Access denied".
I also tried to switch from .Start() to .WaitForNextEvent() with the same result
Anything that I'm missing here?

ClickOnce was activated. Disabling it solved my problem. Thanks tho.

ASP.NET : PerformanceCounter displays nothing

I am a complete beginner in asp.net, C#, etc...
I saw this and this
Then I try this:
using System;
using System.Configuration;
using System.Data;
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.IO;
using System.Text;
using System.Net;
using System.Collections.Generic;
using System.Xml;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Write("Hello from code behind");
PerformanceCounter cpuload = new PerformanceCounter();
cpuload.CategoryName = "Processor";
cpuload.CounterName = "% Processor Time";
cpuload.InstanceName = "_Total";
//or PerformanceCounter cpuload = new PerformanceCounter("Processor", "% Processor Time", "_Total");
Console.WriteLine(cpuload.NextValue() + "%");
}
}
But that only displays Hello from code behind. Why please?

You're writing to the console, which won't work, write to the response instead (just as your string does):
Response.Write(cpuload.NextValue().ToString() + "%");
While applications types that aren't strictly console applications can have an associated console, they're not visible unless explicitly made so, and couldn't be in a web application.