private void TextChanged(object sender, TextChangedEventArgs e)
{
TextBox cell = (TextBox)sender;
int r = Grid.GetRow(cell);
int c = Grid.GetColumn(cell);
try
{
currentBoard[r, c] = Int32.Parse(cell.Text);
this.DisplayBanner(game.CheckProgress(currentBoard));
}
catch (System.FormatException ex) { }
}