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

Thread.Start Method (System.Threading) | Microsoft Learn

Source:: Thread.cs

Source:: Thread.cs

Source:: Thread.cs

Source:: Thread.cs

Causes the operating system to change the state of the current instance to Running, and optionally supplies an object containing data to be used by the method the thread executes.

public:
 void Start(System::Object ^ parameter);

[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public void Start(object? parameter);

public void Start(object? parameter);

public void Start(object parameter);

[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
member this.Start : obj -> unit

member this.Start : obj -> unit

Public Sub Start (parameter As Object)

Parameters

parameter: Object

An object that contains data to be used by the method the thread executes.

Attributes

Exceptions

The thread has already been started.

There is not enough memory available to start this thread.

Examples

The following example creates a ParameterizedThreadStart delegate with a static method and an instance method.

using System;
using System.Threading;

public class Work
{
    public static void Main()
    {
        // Start a thread that calls a parameterized static method.
        Thread newThread = new Thread(Work.DoWork);
        newThread.Start(42);

        // Start a thread that calls a parameterized instance method.
        Work w = new Work();
        newThread = new Thread(w.DoMoreWork);
        newThread.Start("The answer.");
    }
 
    public static void DoWork(object data)
    {
        Console.WriteLine("Static thread procedure. Data='{0}'",
            data);
    }

    public void DoMoreWork(object data)
    {
        Console.WriteLine("Instance thread procedure. Data='{0}'",
            data);
    }
}
// This example displays output like the following:
//       Static thread procedure. Data='42'
//       Instance thread procedure. Data='The answer.'

open System.Threading

type Work() =
    static member DoWork(data: obj) =
        printfn $"Static thread procedure. Data='{data}'"

    member _.DoMoreWork(data: obj) =
        printfn $"Instance thread procedure. Data='{data}'"

// Start a thread that calls a parameterized static method.
let newThread = Thread(ParameterizedThreadStart Work.DoWork)
newThread.Start 42

// Start a thread that calls a parameterized instance method.
let w = Work()
let newThread2 = Thread(ParameterizedThreadStart w.DoMoreWork)
newThread.Start "The answer."

// This example displays output like the following:
//       Static thread procedure. Data='42'
//       Instance thread procedure. Data='The answer.'

Imports System.Threading

Public Class Work
    Shared Sub Main()
        ' Start a thread that calls a parameterized static method.
        Dim newThread As New Thread(AddressOf Work.DoWork)
        newThread.Start(42)

        ' Start a thread that calls a parameterized instance method.
        Dim w As New Work()
        newThread = New Thread(AddressOf w.DoMoreWork)
        newThread.Start("The answer.")
    End Sub
 
    Public Shared Sub DoWork(ByVal data As Object)
        Console.WriteLine("Static thread procedure. Data='{0}'",
                          data)
    End Sub

    Public Sub DoMoreWork(ByVal data As Object) 
        Console.WriteLine("Instance thread procedure. Data='{0}'",
                          data)
    End Sub
End Class
' This example displays output like the following:
'    Static thread procedure. Data='42'
'    Instance thread procedure. Data='The answer.'

Remarks

Once a thread is in the ThreadState.Running state, the operating system can schedule it for execution. The thread begins executing at the first line of the method represented by the ThreadStart or ParameterizedThreadStart delegate supplied to the thread constructor. Note that the call to Start does not block the calling thread.

Once the thread terminates, it cannot be restarted with another call to Start.

This overload and the ParameterizedThreadStart delegate make it easy to pass data to a thread procedure, but the technique is not type safe because any object can be passed to this overload. A more robust way to pass data to a thread procedure is to put both the thread procedure and the data fields into a worker object. For more information, see Creating Threads and Passing Data at Start Time.