When I click on one cell, how do I retrieve the numbers in that cell?

Hi Clyde Eisenbeis,

In WPF, each TextBox already is the cell holding the number. When you click it, you can directly read its value via its Text property.

Simplest approach (handle click / focus)

Attach an event like GotFocus or PreviewMouseDown to each TextBox:

Use Grid.Row & Grid.Column (no naming hacks)

Let WPF tell you the position directly

XAML

Code-behind

private void TextBox_GotFocus(object sender, RoutedEventArgs e)
{
    TextBox tb = sender as TextBox;

    int row = Grid.GetRow(tb);
    int col = Grid.GetColumn(tb);

    int value;
    if (int.TryParse(tb.Text, out value))
    {
        MessageBox.Show($"Row: {row}, Col: {col}, Value: {value}");
    }
}