C#

//declare an array for values to be exposed by Indexer
private int[] myArray;
//Now use the index variable to retrieve the correct from the array by defining the property as under
public int this[int index]
{
   get
   {
      return myArray[index];
   }
   set
   {
      myArray[index] = value;
   }
}

//MyTextBox.cs file
using System;

namespace TestControl2
{
	/// <summary>
	/// Summary description for MyTextBox.
	/// </summary>
	public class MyTextBox : System.Windows.Forms.TextBox
	{
		public enum myVarEnum {Apple,Mango,Peach};
		protected myVarEnum myvar1;

		public myVarEnum MyProperty
		{
			get { return myvar1; }
			set { myvar1 = value; }
		}
		public MyTextBox()
		{
			//
			// TODO: Add constructor logic here
			//
		}
	}
}

//Form1.cs file
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace TestControl2
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private TestControl2.MyTextBox myTextBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Label label1;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.myTextBox1 = new TestControl2.MyTextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// myTextBox1
			// 
			this.myTextBox1.Location = new System.Drawing.Point(184, 48);
			this.myTextBox1.MyProperty = TestControl2.MyTextBox.myVarEnum.Peach;
			this.myTextBox1.Name = "myTextBox1";
			this.myTextBox1.TabIndex = 0;
			this.myTextBox1.Text = "myTextBox1";
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(88, 104);
			this.button1.Name = "button1";
			this.button1.TabIndex = 1;
			this.button1.Text = "button1";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(88, 176);
			this.label1.Name = "label1";
			this.label1.TabIndex = 2;
			this.label1.Text = "label1";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.myTextBox1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			label1.Text = myTextBox1.MyProperty.ToString();
		}
	}
}

• Windows Forms timers (System.Windows.Forms.Timer class), which you drag in the desinger to your form, set some properties, and write the code for the Tick event handler, and that's it. For your situation, the problem is that if the process is long, it will block your UI thread and your main form will not be responsible.
• Thread timer (System.Threading.Timer). I have never used this one, but from the docs[^] it seems you set a timer, without requiring a form, that will run on another thread. So, your form keeps working normally while another thread does your processing on the background.

If someone knows better, feel free to correct me please!

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public int GetWholeNumber(int numerator, int denominator)
{
	int wholeNumber = 0;
	int tempNumber = Numerator;
	
	while(tempNumber >= Denominator)
	{
		tempNumber -= tempNumber ;
		wholeNumber ++ ;
	}
	
	return wholeNumber;
}

int Numerator = 57 ; //for example
int Denominator = 9; //for example
int wholeNumber = (int) (Numerator / Denominator); //wholeNumber would be 6 here, which is the quotient.