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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.threading.thread.threadstate below:

Thread.ThreadState Property (System.Threading) | Microsoft Learn

Gets a value containing the states of the current thread.

public:
 property System::Threading::ThreadState ThreadState { System::Threading::ThreadState get(); };

public System.Threading.ThreadState ThreadState { get; }

member this.ThreadState : System.Threading.ThreadState

Public ReadOnly Property ThreadState As ThreadState

One of the ThreadState values indicating the state of the current thread. The initial value is Unstarted.

The following code example demonstrates accessing the ThreadState of a thread.

using System;
using System.Threading;

class Example
{
    static void Main()
    {
        Thread newThread = 
            new Thread(new ThreadStart(ThreadMethod));

        Console.WriteLine("ThreadState: {0}", newThread.ThreadState);
        newThread.Start();

        // Wait for newThread to start and go to sleep.
        Thread.Sleep(300);
        Console.WriteLine("ThreadState: {0}", newThread.ThreadState);
        
        // Wait for newThread to restart.
        Thread.Sleep(1000);
        Console.WriteLine("ThreadState: {0}", newThread.ThreadState);
    }

    static void ThreadMethod()
    {
        Thread.Sleep(1000);
    }
}
// The example displays the following output:
//       ThreadState: Unstarted
//       ThreadState: WaitSleepJoin
//       ThreadState: Stopped

open System.Threading

let threadMethod () =
    Thread.Sleep 1000

let newThread = Thread threadMethod

printfn $"ThreadState: {newThread.ThreadState}"
newThread.Start()

// Wait for newThread to start and go to sleep.
Thread.Sleep 300
printfn $"ThreadState: {newThread.ThreadState}"

// Wait for newThread to restart.
Thread.Sleep 1000
printfn $"ThreadState: {newThread.ThreadState}"

// The example displays the following output:
//       ThreadState: Unstarted
//       ThreadState: WaitSleepJoin
//       ThreadState: Stopped

Imports System.Threading

Public Module Example
    Public Sub Main()
        Dim newThread As Thread = New Thread(AddressOf ThreadMethod)

        Console.WriteLine("ThreadState: {0}", newThread.ThreadState)
        newThread.Start()

        ' Wait for newThread to start and go to sleep.
        Thread.Sleep(300)
        Console.WriteLine("ThreadState: {0}", newThread.ThreadState)

        ' Wait for newThread to restart.
        Thread.Sleep(1000)
        Console.WriteLine("ThreadState: {0}", newThread.ThreadState)
    End Sub

    Sub ThreadMethod()
        Thread.Sleep(1000)
    End Sub
End Module
' The example displays the following output:
'       ThreadState: Unstarted
'       ThreadState: WaitSleepJoin
'       ThreadState: Stopped

The ThreadState property provides more specific information than the IsAlive property.

Important

Thread state is only of interest in debugging scenarios. Your code should never use thread state to synchronize the activities of threads.

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