ComboBox color changed when changed from Dropdown to DropdownList

Question

Before: It is Dropdown, inside comboBox, it is white color background.

Now: It is Dropdown List, the color inside comboBox turns to grey.

How to change it back to white? I did not find it in property.

Thanks.

Answer 1

Hi VAer-4038,
You can set FlatStyle property to Popup or Flat in ComboxBox's properties page, and the back color will use in both DropDown and DropDownList mode.

More discussions about this problem, you can refer to these threads.
How to change the BackColor of a ComboBox when DropdownStyle is DropDownList?
Combobox DropDownList Style with white background
Best Regards,
Daniel Zhang

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Answer 2

Hi VAer-4038,
In ComboBox Properties page, change DrawMode to OwnerDrawFixed which makes you don't see any items in ComboBox.
So you need to draw something on the given Graphics object in the ComboBox1_DrawItem event.
Test code:

private void Form1_Load(object sender, EventArgs e)  
{  
    comboBox1.Items.Add("a");  
    comboBox1.Items.Add("b");  
    comboBox1.Items.Add("c");  
}  
private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)  
{  
    var Brush = Brushes.Black;  
  
    var Point = new Point(2, e.Index * e.Bounds.Height + 1);  
    int index = e.Index >= 0 ? e.Index : 0;  
    e.Graphics.FillRectangle(new SolidBrush(comboBox1.BackColor), new Rectangle(Point, e.Bounds.Size));  
    e.Graphics.DrawString(comboBox1.Items[index].ToString(), e.Font, Brush, e.Bounds, StringFormat.GenericDefault);  
}  

Test result:

Best Regards,
Daniel Zhang

---

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