How Do I Properly Handle SelectionChanged Events in a DataGridView to Transfer Data to Text Boxes?

Event handling in data table view

Copying data from a datasheet view to a text box is a common need in Windows Forms programming. However, relying solely on code to perform this task can cause problems.

For example, there is an issue in the provided code:

<code class="language-c#">private void DataGridView01_SelectionChanged(object sender, EventArgs e)
{
    if (DataGridView01.SelectedRows.Count > 0)
    {
       // ...
    }
}</code>

Although this code is supposed to execute when a row is selected in the DataGridView, it doesn't actually execute due to a missing event hook.

Hook event

Hook events are crucial for triggering events. In Visual Studio, this can be done from code or directly in the Properties pane.

Via the Properties pane:

1. Select the DataGridView in the designer.
2. Open the lightning icon to view events.
3. Find the SelectionChanged event and double-click on it.
4. Appropriate code stubs will be generated in the form designer code file.

By code:

Alternatively, event hooking can also be done through code, as shown below:

<code class="language-c#">this.DataGridView01.SelectionChanged += new System.EventHandler(this.DataGridView01_SelectionChanged);</code>

After successfully hooking the event, the provided code will work as expected and copy the value of the selected row into the specified text box.

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