⤷ Search record in TQuery

Use something like example below, but it could use some exception handling.
Call DisableControls before iterating through a large number of records in the dataset to prevent data-aware controls from updating every time the active record changes.
Disabling controls prevents flicker and increases speed because data does not need to be written to the display.

procedure TForm1.Button1Click(Sender: TObject);
var
  StringToFind: string;
  CurrentPos: TBookmark;
  Found: Boolean;
begin
  StringToFind:=Edit1.Text;
  if Form1.Query1.State=dsEdit then 
    Form1.Query1.Post;
  if StringToFind='' then 
    Exit;
  with Form1 do
  begin
    CurrentPos:=Query1.GetBookmark;
    Query1.DisableControls;
    Found:=False;
    Query1.Next;
    while (not Query1.EOF) and (not Found) do
    begin
      if Query1.Fields[1].AsString=StringToFind then 
        Found:=True;
      if not Found then 
        Query1.Next;
    end;
    if not Found then
    begin
      MessageDlg(
        'No more matching members found.', 
        mtInformation, 
        [mbOK], 
        0);
      Query1.GotoBookmark(CurrentPos);
    end;
    Query1.EnableControls;
    Query1.FreeBookmark(CurrentPos);
  end;
end;
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