Why Aren't My DataGridView Values Copying to TextBoxes in C#?

Troubleshooting DataGridView to TextBox Data Transfer in C#

This guide addresses common problems when transferring data from a DataGridView to TextBoxes in C#. The DataGridView.SelectionChanged event is typically used for this; however, several factors can prevent successful data transfer.

Confirm Event Registration:

Double-check that the DataGridView01_SelectionChanged event is properly connected to your DataGridView. This can be done visually in the designer (double-clicking the DataGridView), or programmatically in your form's constructor:

<code class="language-csharp">DataGridView01.SelectionChanged += DataGridView01_SelectionChanged;</code>

Verify Row Selection:

Ensure a row is selected within the DataGridView when the event fires. Debugging steps can reveal if a row is actually being selected.

Data Type Handling:

Confirm correct data type conversion. DataGridView cell values might be integers or other non-string types. Always use ToString() to convert them before assigning to TextBoxes:

<code class="language-csharp">personIDTextBox.Text = DataGridView01.SelectedRows[0].Cells[0].Value?.ToString() ?? "";</code>

(The ?. and ?? "" handle null values gracefully, preventing exceptions.)

Exception Handling:

Unhandled exceptions during event execution will block data display. Thoroughly debug your code, checking the output window for errors. Consider adding try-catch blocks to your event handler to trap and handle potential exceptions.

Addressing these points should resolve most data transfer issues between your DataGridView and TextBoxes.

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