Ultimate Pack  hot! Image Editor  new! Runtime Fusion Form Designer Object Inspector Print Suite Pro Commented Image Delphi Toys WinDowse Delphi Bonus TMS Scripter Studio Form Designer VB Form Designer .NET ...get more... for Delphi.NET, C#, VB.NET for Delphi VCL, BCB 3-6

	WinAPI Online Unix Manual Pages MegaDetailed.NET in3steps.com cdtrrracks.com new!   greatis.blogspot.com

You may use OnKeyPress event of your Edit. You should check, if key parameter is not in set '0'..'9' then you must write Key:=#0;

var
  NumSet: set of Char = ['0'..'9'];

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
  if not (Key in NumSet) then
    Key:=#0;
end;

For more

Delphi Help

Download source