Скачать или смотреть Sorting and Filtering Data in DataGridView from a Database Query

Learn how to effectively display sorted query results in a `DataGridView` when working with C# and SQL in WinForms applications.
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This video is based on the question https://stackoverflow.com/q/62860493/ asked by the user 'ashiq pervez' ( https://stackoverflow.com/u/13622761/ ) and on the answer https://stackoverflow.com/a/62878430/ provided by the user 'ashiq pervez' ( https://stackoverflow.com/u/13622761/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Simplifying Data Display in DataGridView: Sorting and Filtering Results

When developing desktop applications using C# and WinForms, one common requirement is to display data from a database in a user-friendly format. However, developers often encounter challenges when the data displayed in a DataGridView appears to be unsorted or fails to filter according to specific criteria. This guide addresses such issues, detailing how to retrieve and display sorted query results effectively.

The Challenge: Displaying Sorted Data

In a recent coding assignment, a developer faced an issue where they could connect to a database and display all entries in the DataGridView, but the data was unsorted. Furthermore, they wanted to filter the data to display results from a specific query rather than all entries from the database.

Code Snippet of the Initial Attempt

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As the above code demonstrates, although the developer attempted to retrieve all necessary fields and sort them by I_Percentage, the implementation wasn't adequately filtering results. This resulted in the DataGridView showing all database entries rather than the targeted ones.

The Solution: Refined Query with Filtering

After reviewing the code, the solution was straightforward: a few modifications were necessary to filter the data and display only those entries relevant to the application. The revised method not only retrieves data but also applies a specific condition to filter the results effectively.

Code Enhancement to Include Filtering

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Key Changes in the Solution

Filtered Data: The SQL query now includes a WHERE clause to focus specifically on entries where prgstatus is 'bscs'.

Ordered Results: The query remains sorted by I_Percentage in descending order, ensuring that the most relevant results appear at the top.

Data Retrieval: The same structure for reading data using SqlDataReader is maintained, allowing for straightforward retrieval of the required fields.

Conclusion

Displaying data in a DataGridView effectively is crucial for enhancing user interaction in your WinForms applications. By filtering your SQL queries correctly and using proper data retrieval techniques, you can ensure that your application shows precisely what is needed in an organized manner. With the solutions outlined above, developers can overcome common pitfalls and create responsive, intuitive data displays.

Implement these techniques, and witness your application’s data display capabilities transform!