Скачать или смотреть How to Add Numbers to Value in Textbox from DataGridView Based on Keyword in VB.NET

Learn how to efficiently add values from a DataGridView into a TextBox based on specific criteria in VB.NET while avoiding common errors.
---
This video is based on the question https://stackoverflow.com/q/68669729/ asked by the user 'Ali_D' ( https://stackoverflow.com/u/16463200/ ) and on the answer https://stackoverflow.com/a/68674811/ provided by the user 'Mary' ( https://stackoverflow.com/u/8367626/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to add Number to Value in Textbox from DataGridView based on Keyword

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Add Numbers to Value in Textbox from DataGridView Based on Keyword in VB.NET

When working with forms in VB.NET, particularly in reporting costs or aggregating data, you might encounter situations where you need to total values conditionally based on certain criteria. For instance, if you have a DataGridView that contains employee wages categorized by department, it can be quite cumbersome if you don't handle the data correctly.

In this guide, we will explore how to add values from a DataGridView to a TextBox based on a specified keyword while addressing common pitfalls, such as the System.ArgumentOutOfRangeException error.

Understanding the Problem

The scenario involves a VB.NET Form where employee pay data is displayed in a DataGridView. The goal is to sum up the wages of employees who belong to a specific department (e.g., "Design") and display the total in a corresponding TextBox.

Common Error

You may encounter the following error:

[[See Video to Reveal this Text or Code Snippet]]

This rings alarm bells that there might be a logical error in how data is being processed, especially concerning the iteration over rows in the DataGridView.

Breaking Down the Solution

Let’s fix the issue step by step.

1. Correcting the Loop Index

The first problem was with the use of the row count in the For loop. In VB.NET, the index for collections (like rows in a DataGridView) starts at 0, while counting typically starts at 1.

Incorrect Usage:

[[See Video to Reveal this Text or Code Snippet]]

This way you may attempt to access an index that doesn't exist when i equals Job_Viewer.Rows.Count.

Correct Usage:

[[See Video to Reveal this Text or Code Snippet]]

2. Converting Types

The Value property of cells in a DataGridView returns an Object, which means it needs to be explicitly converted into a Decimal for calculations and a String for comparisons. This is where the type conversion is essential.

3. Implementing the Code

Here’s how you can implement the solution in your VB.NET application:

[[See Video to Reveal this Text or Code Snippet]]

4. Additional Tips

Enable Option Strict: It’s beneficial to turn on Option Strict in your project properties. This helps catch type conversion issues at compile time rather than runtime, allowing your code to be safer and more predictable.

Validate Input Data: Always validate the data if you expect certain formats before processing them further.

Conclusion

By following these steps, you should be able to successfully add numbers from a DataGridView into a TextBox based on specified criteria without running into index errors. The key takeaway is to handle your loops and type conversions carefully to ensure smooth and error-free execution of your code.

Happy coding in VB.NET! If you have any questions or need further assistance, feel free to comment below!