MSSQL Tutorial: HOW TO CREATE BASIC GST CALCULATOR IN ASP.NET

HERE IN THIS .NET Tutorial WE WILL CREATE BASIC GST CALCULATOR IN ASP.NET - (ADD GST AND REMOVE GST)

GST Tax Calculation Formula
All one needs to do is input the net amount of a good or service and the applicable GST rate (5%, 12%, 18% or 28%) into the tool. Click on the 'Calculate' button and instantly get the gross price of the good or service. GST calculation is represented by the below example:

A goods or service is sold at the rate of Rs.500. GST rate is 18%. Gross amount of the goods or service = 500 + [500 x (18/100)] = Rs.590

Formula for GST calculation:

Add GST:
-----------------------------------------------------------------------------------------------------------------------------
GST Amount = (Original Cost x (GST% /100) )

Net Price = Original Cost + GST Amount
-------------------------------------------------------------------------------------------------------------------------------
Original Cost=500
GST%= 18%
GST Convert=(18/100)=0.18
GST Amount =Original Cost * GST Convert
GST Amount = 500 * 0.18=90
Net Price = Original Cost + GST Amount
Net Price = 500 +90=Rs 590.

-------------------------------------------------------------------------------------------------------------------------------
Remove GST:
GST Amount = Original Cost - [Original Cost x {100/(100+GST%)}]

Net Price = Original Cost - GST Amount
--------------------------------------------------------------------------------------------------------------------------------
Original Cost=500
GST%= 18%
GST Amount = Original Cost - [Original Cost x {100/(100+GST%)}]
GST Amount = 500 - [500 x {100/(100+18)}]=76.271186
Net Price = Original Cost - GST Amount
Net Price = 500 - 76.271186=423.728814

As Per Indian GST System.

So Let Begin With Coding

Step1 :- Design Form And Save As Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 112px;
}
</style>
</head>
<body style="height: 75px; width: 575px">
<form id="form1" runat="server">
<div>

<table style="width: 62%; height: 71px;">
<tr>
<td class="style1">
<asp:Label ID="Label1" runat="server" Text="Original Cost :-"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style1">
<asp:Label ID="Label2" runat="server" Text="GST% :-"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style1">
 </td>
<td>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Add GST" />
 
<asp:Button ID="Button2" runat="server" onclick="Button2_Click"
Text="Remove GST" />
</td>
</tr>
<tr>
<td class="style1">
 </td>
<td>
 </td>
</tr>
<tr>
<td class="style1">
 </td>
<td>
<asp:Label ID="Label3" runat="server" Text="Net Price :-"></asp:Label>
 
<asp:Label ID="Label4" runat="server" Font-Bold="True" ForeColor="#00CC00"></asp:Label>
</td>
</tr>
</table>

</div>
</form>
</body>
</html>

Step 2 : C# Code

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

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

}
protected void Button1_Click(object sender, EventArgs e)
{
decimal OriginalCost = Convert.ToDecimal(TextBox1.Text);
decimal GST = (Convert.ToDecimal(TextBox2.Text)/100);
decimal GSTAmount = (OriginalCost + (OriginalCost * GST));
Label4.Text = GSTAmount.ToString();

}
protected void Button2_Click(object sender, EventArgs e)
{
decimal OriginalCost = Convert.ToDecimal(TextBox1.Text);
decimal GST = Convert.ToDecimal(TextBox2.Text);
decimal GSTAmount = (OriginalCost - (OriginalCost * (100/(100+GST))));
decimal NetPrice = OriginalCost - GSTAmount;
Label4.Text = NetPrice.ToString();

}
}

Output :-