Step 1: Start Microsoft Visual Studio 2012 and click "New Project".
Step 2: Select "Windows Form Application" and name it "Output".
Step 3: From the tool box, drag a button and a label onto the form.
Step 4: Open the properties window and rename your button to "btnOutput" and label to "lblOutput
Step 5: Double click the button to access the code, it should look as seen below.
Step 6: Between the squiggly brackets write MessageBox.Show("Hello World!"). When the user runs the program, the output should be as follows.
Input is the code entered into a program and Output is the information displayed to the viewer. In this case, the user entered MessageBox.Show(Hello World!") into Microsoft Visual Studio, this is the Input. When the button is clicked, the text box says "Hello World!", this is the Output.