AUTO: Takes as much SPACE as needed by the contained control. And it will make the each row/column size so it can fit WHATEVER is contained in it.

"Star(*)": MEANS stretch row/column size to fill the available space, and is a fraction, so if one row is * and the other row is 2* then the second row will be twice the size of the first row.

So for example, you may have two rows, bottom row has a button and is Auto (only as high as the button) and the top row is "*" - stretches to the remaining space available.

<Grid>

<Grid.RowDefinitions>

<RowDefinition Height="*"/>

<RowDefinition Height="Auto"/>

</Grid.RowDefinitions>

<Button Content="Test" Grid.Row="1" />

 </Grid>

Auto: Takes as much space as needed by the contained control. And it will make the each row/column size so it can fit whatever is contained in it.

"Star(*)": means stretch row/column size to fill the available space, and is a fraction, so if one row is * and the other row is 2* then the second row will be twice the size of the first row.

So for example, you may have two rows, bottom row has a button and is Auto (only as high as the button) and the top row is "*" - stretches to the remaining space available.

<Grid>

<Grid.RowDefinitions>

<RowDefinition Height="*"/>

<RowDefinition Height="Auto"/>

</Grid.RowDefinitions>

<Button Content="Test" Grid.Row="1" />

 </Grid>