Скачать или смотреть Resolving the ColumnCount Property Error in Data-Bound DataGridView in C#

Learn how to effectively add rows to a data-bound DataGridView without encountering the `ColumnCount` property error in C# . Follow our step-by-step solution and more!
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This video is based on the question https://stackoverflow.com/q/66554517/ asked by the user 'Ziad Adnan' ( https://stackoverflow.com/u/14008146/ ) and on the answer https://stackoverflow.com/a/66561602/ provided by the user 'JohnG' ( https://stackoverflow.com/u/6842716/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the ColumnCount Property Error in DataGridView Control

When working with a DataGridView in C# , you may find yourself trying to set the ColumnCount property while attempting to add new rows to a data-bound control. Unfortunately, this can trigger an error message stating: ColumnCount property cannot be set on a data-bound DataGridView control. Such errors can be frustrating, especially when you want to seamlessly add new rows to your display.

In this post, we'll explore a common scenario where this error arises and present a step-by-step solution to overcome the issue without losing existing data in your DataGridView. Let’s dive in!

The Problem: Data-Bound DataGridView Control

The Background

You might be working with a DataGridView that is populated with data from a database using a stored procedure. For instance, you could retrieve laboratory results based on a specific order ID, as demonstrated below:

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

The Code

When populating the DataGridView, you handle input through a key event. Here’s how you might fill the DataGridView when the user hits enter after entering an order ID:

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

The Error Encountered

Later on, when you attempt to add new rows by manipulating the ColumnCount property and re-adding the column definitions, you encounter this error:

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

This error occurs because the DataGridView is already bound to a data source, and trying to modify columns is not permissible.

The Solution: Adding Rows Without Clearing Data

Step 1: Retrieve the Current DataTable

Instead of altering the columns, retrieve the DataTable used as the DataSource for your DataGridView and add rows to it directly. Use the following code to access the bound DataTable:

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

Step 2: Add the New Row

Once you have the DataTable, you can add a new row with the data collected from your combo boxes. Here’s an example of how to do this:

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

Consider Using BindingSource

To simplify data operations, you may consider utilizing a BindingSource. This approach offers advantages such as better handling of data synchronization between the data source and the user interface.

Conclusion

By following these steps, you can effectively resolve the ColumnCount property error in a data-bound DataGridView without losing any existing data. Instead of resetting the columns of your DataGridView, you can directly manipulate the DataTable used as its data source, enabling smooth operations as you continue to build your application.

If you need further assistance or have any questions, feel free to ask. Happy coding!