Visual Basic

dim source as string = "This is a search"<br />
dim source2 as string  = "This a atring"<br />
dim search  as string = "This is"<br />
<br />
Console.WriteLine(source.IndexOf(search)) ' Prints "0" as the search exists at position 0<br />
Console.WriteLine(source2.IndexOf(search)) ' Prints "-1" as the search does not exist at all

foreach(Control control in myForm.Controls)
{
  if(control is TextBox)
  {
    // do something with a textbox
  }
  else if(control is ComboBox)
  {
    // do something with combo box
  }
  // etc.
}