c# - ComboBox.DropDownHeight values doesn't change when adding or removing items -


when running following code in wfa

public partial class form1 : form {     string[] items = { "a", "b", "c", "d", "e" };      public form1()     {         initializecomponent();         updatedropdownheight();     }      private void updatedropdownheight()     {         textbox1.text = combobox1.dropdownheight.tostring();     }      private void button_populate_click(object sender, eventargs e)     {         for(int = 0; i<items.length; i++)         {             combobox1.items.add(items[i]);         }         updatedropdownheight();     }      private void button_clear_click(object sender, eventargs e)     {         combobox1.items.clear();         updatedropdownheight();     } }

i have noticed combobox1.dropdownheight value never changes when new items added combo box. apparent drop down area changes when button_populate clicked through.
users question

combo box size issue after items removed

provides perplexing answer on how resize apparent drop down area after removing items. purpose of dropdownheight property , changing apparent drop down area of combobox?

also not sure problem you're trying solve, if you're trying adjust height of dropdownheight, can achieved below.

private void updatedropdownheight() {     int dropdownheight = 0;     (int = 0; <= combobox1.items.count; i++)     {         dropdownheight = dropdownheight + (combobox1.itemheight);     }     combobox1.dropdownheight = dropdownheight;     textbox1.text = combobox1.dropdownheight.tostring(); }

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