Why Aren't My Text Boxes Populating with Selected DataGridView Row Data?

Troubleshooting DataGridView: Text Box Data Population

You've connected the SelectionChanged event of your DataGridView to populate text boxes with selected row data, but the text boxes remain empty. Let's troubleshoot this common problem.

The Root Cause: Event Handler Connection

The core issue often lies in how the SelectionChanged event is linked to your code. Visual Studio offers several ways to establish this connection, and a misconfiguration can prevent data transfer.

1. Manual Code Hookup: You've likely already attempted this, directly assigning the event handler in your code.
2. Designer Event Property: In the Visual Studio designer, select the DataGridView, find the "Events" property, locate SelectionChanged, and double-click to automatically generate the handler.
3. Double-Click Event Generation: Simply double-clicking the DataGridView control in the designer can also create the SelectionChanged event handler.

Verification Steps:

Carefully review your event handler connection using one of the above methods. Ensure the connection is correctly established.

Further Checks:

• Row Selection: Confirm that rows are actually selected in the DataGridView before attempting data access.
• Column References: Double-check that your code correctly references the DataGridView columns. Incorrect column names or indices will prevent data retrieval.
• TextBox Consistency: Verify that the text box names and data formatting align with the data extracted from the DataGridView. Type mismatches (e.g., trying to assign a number to a text box expecting text) can also lead to issues.

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