C# tutorials
5. Getting the result out of a foreach loop

Note: While reading this page, bear in mind that I'm no computer expert and that the text below may be partly inaccurate. If you find errors or have proposals for improvements, please send me a message and help make this a better page for the benefit of future visitors. To the left, there are links to more C# tutorials.


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:

string[] hello = { "Hello", "world!", "Goodbye", "world ..." };
string result = null;
foreach (string value in hello)
{
  result += value + "\n";
}
richTextBox1.Text = result + "See you tomorrow.";

9. Press F5 to start debugging the program.

10. Click on the button. This text should appear in the textbox:

Hello
world!
Goodbye
world ...
See you tomorrow.

Comments on the code snippet

Line 2: Initialize the empty string result, that will get contents in the foreach loop. This must be done before the foreach statement.

Line 5: The string result is filled with values from the array hello.

Line 7: The textbox is filled with the string result and some additional text.

More

See also the comments on C# tutorials: 4. Hello world with array and foreach loop.


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