Change the ForeColor of individual items in a ComboBox (C# Winforms)

Following steps-

1-  select drowmode property to ownerDrawFixed

2-

private void Form2_Load(object sender, EventArgs e)

        {

         

                this.comboBox1.Items.Add("Test1");

                this.comboBox1.Items.Add("Test2");

                this.comboBox1.Items.Add("Test3");

                this.comboBox1.Items.Add("Test4");

                this.comboBox1.Items.Add("Test5");

                this.comboBox1.Items.Add("Test6");

           

        }

        private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)

        {

            // Draw the background

            e.DrawBackground();

            // Get the item text   

            string text = ((ComboBox)sender).Items[e.Index].ToString();

            // Determine the forecolor based on whether or not the item is selected   

            Brush brush;

            if (IsItemDisabled(e.Index))// compare  date with your list. 

            {

                brush = Brushes.Red;

            }

            else

            {

                brush = Brushes.Gray;

            }

            // Draw the text   

            e.Graphics.DrawString(text, ((Control)sender).Font, brush, e.Bounds.X, e.Bounds.Y);

        }

        void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

        {

            if (IsItemDisabled(comboBox1.SelectedIndex))

                comboBox1.SelectedIndex = -1;

        }

        bool IsItemDisabled(int index)

        {

            // We are disabling item based on Index, you can have your logic here

            return index % 2 == 1;

        }