Example with Textbox Label,Button:-



Add a new Form i.e.,FormGenerateRangeNumbers to the Windows Application i.e.,WABasics

Create three labels,two textboxes and twobuttons & set the following properties to them


label1:
     Text    :  From
     Name  :  lblFrom


label2:
     Text    :  To
     Name  :  lblTo


label3:
     Text   : Generated Numbers Are
     Name : lblNumbers



textbox1:
     Name  :  txtFrom



textbox2:
     Name  : txtTo



textbox3:
     Name        :  txtNumbers
     ReadOnly :  True


button1:
     Name  :  btnGenerate
     Text    :  Generate



Design :-



Generate the Event Handler for btnGenerate Click Event

& write the following code in Source[FormGenerateRangeNumbers.cs] 

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;

namespace WABasics
{
    public partial class FormGenerateRangeNumbers : Form
    {
        public FormGenerateRangeNumbers()
        {
            InitializeComponent();
        }

        private void btnGenerate_Click(object sender, EventArgs e)
        {
            txtNumbers.Clear();
            int Num1 = Convert.ToInt32(Console.ReadLine());
            int Num2 = Convert.ToInt32(Console.ReadLine());
            for (int i = Num1; i <= Num2; i++)
            {
                txtNumbers.Text = txtNumbers.Text  +  i+  "  ";
            }
            txtFrom.Focus();

        }
    }
}



Result :-


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