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 :-