How to use SetColumnSpan?

I am using the normal Grid, and adding Labels to from code, like tihs:

int a = 5;
Label lb = new Label();
lb.Content = a;

Grid.SetColumn(lb,i);
Grid.SetRow(lb, 1);
MyGrid.Children.Add(lb);
Grid.SetColumnSpan(lb,3);

The Label is added correctly to the Grid, but the columnspan is ineffective.Is it possible to do something like this?

Solution

Your code is ok. If you want to check this you should assign to the label content more data and grid property ShowGridLines (msdn) set to true.

Example:

<Grid x:Name="MyGrid" ShowGridLines="True">
    <Grid.RowDefinitions>
        <RowDefinition Height="30" />
        <RowDefinition Height="30" />
        <RowDefinition Height="30" />
        <RowDefinition Height="30" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="50" />
        <ColumnDefinition Width="50" />
        <ColumnDefinition Width="50" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
</Grid>

code-behind:

Label lb = new Label();
lb.Content = "1234567890123456789012345678901234567890";

Grid.SetColumn(lb, 1);
Grid.SetRow(lb, 1);
MyGrid.Children.Add(lb);
Grid.SetColumnSpan(lb, 3);

Result:

enter image description here