How to change asp:ListBox1 row background color

Question

I have an asp:ListBox1 and two buttons. When I click on button 1, I add a text to ListBox1 .

 protected void Button1_Click(object sender, EventArgs e)
 {
    ListBox1.Items.Add("Message1");
 }

When I click on the second button, another thext is added to ListBox1 .

 protected void Button2_Click(object sender, EventArgs e)
 {
    ListBox1.Items.Add("Message2");
 }

The messages are correctly added. I want to change the background color for each row. For example, I want the row with "Message1" text to have a red background and the other row to have green background. How could I do this?

Answer 1

you can use this code for asp.net

protected void Button1_Click(object sender, EventArgs e)
 {
    ListItem message1 = new ListItem("Message1","Message1");
    message1.Attributes.Add("style", "background-color: RED");
    ListBox1.Items.Add(message1);
 }


protected void Button2_Click(object sender, EventArgs e)
 {
    ListItem meassage2 = new ListItem("Message2","Message2");
    message2.Attributes.Add("style", "background-color: GREEN");
    ListBox1.Items.Add(message2);
 }

Answer 2

private void InitializeListBox()
{
    //ad mode to draw 
    ListBox1.DrawMode = DrawMode.OwnerDrawFixed;
    ListBox1.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);
    Controls.Add(ListBox1);
}

private void ListBox1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e){
    // Draw the background of the ListBox control for each item.
    e.DrawBackground();
    // Define the default color of the brush as black.
    Brush myBrush = Brushes.Black;
    switch(ListBox1.Items[e.Index].ToString()){
       case "Message1" : myBrush = Brushes.Red; break;
       case "Message2" : myBrush = Brushes.Green;break;   
    }

   // Draw the current item text based on the current Font 
   // and the custom brush settings.
   e.Graphics.DrawString(ListBox1.Items[e.Index].ToString(), 
        e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
    // If the ListBox has focus, draw a focus rectangle around the selected item.
    e.DrawFocusRectangle();
}