Design

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Arithmetic_Operation : System.Web.UI.Page
{
    protected void BtnAddition_Click(object sender, EventArgs e)
    {
        int a, b, c;
        a = Convert.ToInt16(txtNum1.Text);
        b = Convert.ToInt16(txtNum2.Text);
        c = a + b;
        txtResult.Text = c.ToString();
    }
    protected void BtnSubstraction_Click(object sender, EventArgs e)
    {
        int a, b, c;
        a = Convert.ToInt16(txtNum1.Text);
        b = Convert.ToInt16(txtNum2.Text);
        c = a - b;
        txtResult.Text = c.ToString();
    }
    protected void BtnMultiplication_Click(object sender, EventArgs e)
    {
        int a, b, c;
        a = Convert.ToInt16(txtNum1.Text);
        b = Convert.ToInt16(txtNum2.Text);
        c = a * b;
        txtResult.Text = c.ToString();
    }

    protected void BtnDivision_Click(object sender, EventArgs e)
    {
        int a, b, c;
        a = Convert.ToInt16(txtNum1.Text);
        b = Convert.ToInt16(txtNum2.Text);
        c = a / b;
        txtResult.Text = c.ToString();
    }
    protected void BtnSquare_Click(object sender, EventArgs e)
    {
        int a, b;
        a = Convert.ToInt16(txtNum1.Text);
        b = a * a;
        txtNum2.Text = b.ToString();
    }
    protected void BtnCube_Click(object sender, EventArgs e)
    {
        int a, b;
        a = Convert.ToInt16(txtNum1.Text);
        b = a * a * a;
        txtNum2.Text = b.ToString();
    }
    protected void BtnGreatest_Click(object sender, EventArgs e)
    {
        int a, b;
        a = Convert.ToInt16(txtNum1.Text);
        b = Convert.ToInt16(txtNum2.Text);
        if (a > b)
        {
            txtResult.Text = a.ToString(" number 1 is greatest");
      }
      else if (a= =b)
      {
      txtresult.text=("Both are same.");
      }
      else
      {
      txtresult.text=b.ToString("Number 2 is greatest");
      }
      }
      }

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Output