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Learn how to efficiently list files from multiple folders in a ListBox without including any subfolders using VB.NET.
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This video is based on the question https://stackoverflow.com/q/75678188/ asked by the user 'Nathaniel Turner' ( https://stackoverflow.com/u/20922879/ ) and on the answer https://stackoverflow.com/a/75678279/ provided by the user 'Tim Schmelter' ( https://stackoverflow.com/u/284240/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to List Files in a ListBox Without Subfolders in VB.NET

When developing applications using Visual Basic .NET (VB.NET), one common requirement is to display files from a specific directory in a user interface element like a ListBox. However, developers sometimes face the challenge of unintentionally including subfolders and their files in their lists. If you find yourself in a situation where you want to list only the files from a folder, excluding any subfolders, this guide is for you.

The Problem

Suppose you are working with a folder structure and you need to read files from multiple directories. Your goal is to present these files in a single ListBox while ensuring that any files nested within subfolders are left out. This requirements could arise due to user interface considerations or program logic that only cares about top-level files.

The Solution

Using the SearchOption.TopDirectoryOnly Property

To achieve the desired result, you can utilize VB.NET's SearchOption.TopDirectoryOnly when retrieving files. This option allows you to specify that your search should only include files in the specified directory without traversing into any subdirectories.

Step-by-Step Breakdown

Set Up the ListBox: Ensure your ListBox is ready to display multiple selections. In your VB.NET form, set the SelectionMode of your ListBox to MultiSimple to allow for multiple selections by the user.

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Specify the Directories: Define the directories from which you want to retrieve the files. You may have two or more directories to combine.

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Retrieve Files Using EnumerateFiles: Use the EnumerateFiles method with the SearchOption.TopDirectoryOnly. This ensures that only files within the base directory are included.

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Combine Files and Populate the ListBox: Combine the files obtained from both directories and add them to your ListBox.

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Final Code Example

Here’s what the complete code snippet will look like with all the steps combined:

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Conclusion

By following the steps outlined above, you can effectively list files from multiple folders into a single ListBox in your VB.NET application without including any subfolders. This approach not only keeps your UI clean and focused but also enhances the overall user experience by presenting information in a straightforward manner.

Whether you're developing a file management application or any kind of tool that interacts with the file system, leveraging the SearchOption.TopDirectoryOnly property can save you from dealing with unnecessary complexity from subdirectories.

Feel free to adapt this pattern in your projects where applicable, and happy coding!