In this example, we’ll change the color of Listbox item according to the conditional.
If the item value is greater than 100, the color will be red.
C# Code:
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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace change_element_color_listbox { public partial class Form1 : Form { public Form1() { InitializeComponent(); listBox1.BackColor = Color.Beige; listBox1.DrawMode = DrawMode.OwnerDrawFixed; listBox1.DrawItem += new DrawItemEventHandler(listBox1_SetColor); } void listBox1_SetColor(object sender, DrawItemEventArgs e) { try { e.DrawBackground(); Brush myBrush = Brushes.White; int sayi = Convert.ToInt32(((ListBox)sender).Items[e.Index].ToString()); if (sayi > 100) { myBrush = Brushes.Red; } else { myBrush = Brushes.Green; } e.Graphics.DrawString(((ListBox)sender).Items[e.Index].ToString(), e.Font, myBrush, e.Bounds, StringFormat.GenericDefault); e.DrawFocusRectangle(); } catch { } } private void button1_Click(object sender, EventArgs e) { try { listBox1.Items.Add(textBox1.Text); } catch { MessageBox.Show("Error!!! csharp-console-examples.com"); } } private void Form1_Load(object sender, EventArgs e) { this.Text = "csharp-console-examples.com"; } } } |
Output:
