7. Hello world message box with if and else
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To complete this tutorial, follow these instructions:
1. Open Visual C# 2010 Express.
2. Click on New Project in the File menu.
3. Choose Windows Forms Application if that option isn't already chosen, change the name if you like and click on OK.
4. Point at Toolbox in the left margin and click on the Auto Hide icon at the top of the window (to keep the window to stay open and easier to work with).
5. Drag a Button to Form 1.
6. Drag a Rich Textbox to Form 1. Resize the textbox if you like.
7. Double-click on the button. The file Form1.cs will open with the caret ready to write code that will run when button 1 is clicked.
8. Write or paste this code where the caret is:
DialogResult answer = MessageBox.Show("Display \"Hello world\" in the textbox?", "Question", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (answer == DialogResult.Yes)
richTextBox1.Text = "Hello world!";
richTextBox1.Text = null;
9. Press F5 to start debugging the program.
10. Click on the button. A message box with the text
Display 'Hello world' in the textbox?, the name
Question, the buttons
No, and the icon
Question should appear.
11. Click on the
Yes button. The text
Hello world! should appear in the text box.
12. Click on the
No button. The text box should become or remain empty.
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