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To design a simple calculator that calculates the square of a number input by the user and displays it in another textbox, we can use a programming environment that supports event-driven programming, such as Visual Basic or C#. Here, I'll outline the procedure and provide an implementation for such a calculator.

### Step 1: Setting up the User Interface

In your development environment, start by creating a Windows Forms Application or a similar graphical user interface (GUI) application. The interface will consist of:

- A TextBox for the user to enter a number (let's call it `txtNumber`).
- A Button to trigger the square calculation (let's call it `btnCalculate`).
- Another TextBox to display the result (let's call it `txtResult`).

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