MDAS Calculator In C#

Now, in this tutorial, I will show you how to create MDAS calculator in C#.
MDAS are the four fundamental operations in the calculation which stand for Multiplication, Division, Addition and Subtraction that are very common to remember, sounds good right?
So, if you want to create your own MDAS calculator? These easy steps below will guide you on how to do it.
Let’s begin:
Open Microsoft Visual Studio and create a new windows form application. After that, do the form as follows.

Go to the solution explorer, hit the “code view” to fire the code editor.

In the code editor, declare a variable to represent the total of the MDAS.
double total = 0;Do the following codes for Multiplication methods.
private void btnMultiply_Click(object sender, EventArgs e)
{
//set a formula for multiplication
total = double.Parse (txtFinput.Text) * double.Parse (txtSinput.Text);
//add the answer in the listbox
lstOutput.Items.Add(double.Parse (txtFinput.Text) + " * " + double.Parse (txtSinput.Text) + " = " + total);
}Do the following codes for Division methods.
private void btnDivide_Click(object sender, EventArgs e)
{
//set a formula for Division
total = double.Parse(txtFinput.Text) / double.Parse(txtSinput.Text);
//add the answer in the listbox
lstOutput.Items.Add(double.Parse(txtFinput.Text) + " / " + double.Parse(txtSinput.Text) + " = " + total);
}Do the following codes for Addition methods.
private void btnAdd_Click(object sender, EventArgs e)
{
//set a formula for addition
total = double.Parse(txtFinput.Text) + double.Parse(txtSinput.Text);
//add the answer in the listbox
lstOutput.Items.Add(double.Parse(txtFinput.Text) + " + " + double.Parse(txtSinput.Text) + " = " + total);
}Do the following codes for Subtraction methods.
private void btnSubtract_Click(object sender, EventArgs e)
{
//set a formula for subtraction
total = double.Parse(txtFinput.Text) - double.Parse(txtSinput.Text);
//add the answer in the listbox
lstOutput.Items.Add(double.Parse(txtFinput.Text) + " - " + double.Parse(txtSinput.Text) + " = " + total);
}Output:

Download the Source Code here:
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| ABOUT PROJECT | PROJECT DETAILS |
|---|---|
| Project Name : | MDAS calculator |
| Project Platform : | C# |
| Programming Language Used: | C# Programming Language |
| Developer Name : | itsourcecode.com |
| IDE Tool (Recommended): | Visual Studio 2019 |
| Project Type : | Desktop Application |
| Database: | None |
| Upload Date and Time: | June 29, 2016- 7:34 am |
Frequently Asked Questions
How does this C# project work?
Built with C# WinForms (.NET Framework or .NET 6/7/8) and SQL Server backend. Standard structure: Form designer → code-behind event handlers → ADO.NET data access layer → SQL Server. Login form for auth. Ready to extend for BSIT capstone scope.
What .NET and SQL Server versions does this project require?
Most projects in this batch use C# WinForms on .NET Framework 4.5+ (the dominant stack for tutorial sites) with SQL Server 2012 Express or higher. A few newer projects use .NET 6/7/8. To run: install Visual Studio 2019 / 2022 (Community edition is free), install SQL Server Express + SSMS, open the .sln file, build, run.
How do I set up the database for this C# project?
Open SQL Server Management Studio (SSMS) and connect to your SQL Server instance (e.g. localhost\SQLEXPRESS). Right-click Databases > Restore Database OR > New Database then import the included .sql script. Update the connection string in App.config (or in code-behind) with your server name + credentials. Rebuild and run.
Can I use this C# project for a BSIT capstone or thesis?
Yes, but extend it. A bare CRUD form is too narrow for full capstone scope. Add: role-based access (admin/staff/customer login redirect), Crystal Reports or RDLC reports, dashboard with Chart controls, audit log, multi-branch support. Pair with Chapter 1-5 documentation matching your panel’s rubric.
Why am I getting ‘connection error’ or ‘object reference not set’?
Three common C# issues: (1) Connection error: SQL Server isn’t running OR connection string in App.config has wrong server name. Open SQL Server Configuration Manager + verify SQL Server (SQLEXPRESS) service is running. (2) NullReferenceException: a control reference or DB column returned NULL, add a check or use ?? operator. (3) Build error ‘The type or namespace could not be found’: missing assembly reference, add via Project > Add Reference.
Where can I find more C# projects with source code?
Browse the C# Projects hub for the full library. For other .NET stacks see VB.NET Projects (300+ Windows Forms systems). For ASP.NET WebForms see ASP.NET Projects. For BSIT capstone idea lists see 150 Best Capstone Project Ideas.