RiggsHill Software

Iterating a Form's controls:

var qry = from c in this.Controls.OfType<Control>()
              select c;
foreach ( var c in qry )
    MessageBox.Show( c.Name + ":" + c.GetType().ToString(), "Control Type" );

The Controls collection is not directly usable in the query - the OfType method performs the necessary conversions. To grab all controls of a specific type:

var q2 = from c in this.Controls.OfType<NumericUpDown>() select c;