Finding all controls of specified type on a form

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From: Joe S. (dontmail_at_nowhere.com)
Date: 08/08/04 

Date: Sun, 8 Aug 2004 23:36:04 +0200

I need to find all instances of a specific type of control on a Windows
Form -- for example all DataGrids. The code I came up with is this:

foreach(Control ctrl in this.Controls)
{
  if(ctrl.GetType() == Type.GetType("System.Windows.Forms.DataGrid"))
    Console.WriteLine(((DataGrid)ctrl).Name);
}

This code has two problems. Something's wrong with the type checking,
because it doesn't find any DataGrids on a form.

Even if it did work, the second problem is that this would find only
DataGrids put directly on the form (in the Form.Controls collection), but a
Grid can also be in the ControlCollection of a GroupBox or some other
container. How to loop through all controls in a form regardless of their
parent control?

Best regards,
Joe

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