Create A Calculator In Windows Form Application

Here are the steps to create a simple calculator in Windows Forms.

Create a Windows Application project from the file menu.
FILE, New, then click Project.
A popup window will appear. Choose “Windows” from the templates and choose the project “Windows Forms Application.” I have named it “Simple Calculator.”
Create the form design using buttons and text boxes.
Add 0-9, sign (/,*, -, +, %) buttons, backspace, Clear (C), and point (.) buttons.
Add a textbox to show the results.

On each button, click use the following login.

private void btn0_Click(object sender, EventArgs e)
{
    txtResult.Text = txtResult.Text + "0";
}

On operations buttons (+,-, /,*, %) take care of the following cases.
1. The signs should not be in first place in the textbox i.e. +1, /2 etc.
2. If you press point(.), then in add zero before point i.e. 0.9
3. For the Backspace button, remove the last character from the textbox.
4. For the C button clear the text of the text box.
5. The signs should not appear twice i.e. 4++,9**
6. The point should not come twice i.e. 2.3.5
7. It cannot be divided by zero.
8. Cannot find modulus by Zero.
Now, we will follow the Microsoft Calculator logic for calculations.
When we press the digit sign, then again we press the sign, the result of the first expression will be used for the next expression i.e.
- 5+8+, and then the result will be 13+ in the result section.
We have to take care of integer numbers as well as float numbers.
For the Equal button, I have used the switch statement.
For more information, please see the source code attached as zip.

Thank you.