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Use Common Handler in ASP.NET

HOW TO PERFORM MATHEMATICAL OPERATION WITH THE HELP OF COMMON HANDLER.

CODE IN THE DEFAULT.ASPX PAGE:-




Enter the first digit
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

Enter the second digit
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

Sum of two digits
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>


<asp:Button ID="Button1" runat="server" Text="Addition" OnClick="Button1_Click">

<asp:Button ID="Button2" runat="server" Text="Subtraction" OnClick="Button1_Click">

<asp:Button ID="Button3" runat="server" Text="Division"
OnClick="Button1_Click"/>

<asp:Button ID="Button4" runat="server" Text="Multiplication" OnClick="Button1_Click"/>





WRITE CODE IN THE DEFAULT.ASPX.CS PAGE:-


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default14 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
if (sender == Button1)
{
TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) + Convert.ToInt32(TextBox2.Text));
}
else if (sender == Button2)
{
TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) - Convert.ToInt32(TextBox2.Text));
}
else if (sender == Button3)
{
TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) / Convert.ToInt32(TextBox2.Text));
}
else
{
TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) * Convert.ToInt32(TextBox2.Text));
}
}
}

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