Passing Values between user controls

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ASP.NET

Hello
(I have a problem in desining a page. I created two user controls. in one user control i took the dropdown list, in second user control i took the label. i added these two user controls in one webpage. In drop down list i took the colors. When i change the value in drop down list it display the color according to that value in the second user control. and onething is dont take any events in the webpage it means button events. If it is possible How can I create this.
Can you Give me any idea. If it is possible give the sample code. It is very useful to me. or give any best tutorial site name because i new to the asp.net)
This is i asked the question last time. I get one reply.

Thank you for giving the solution. I tried your solution but it wont work. i think i may be write some mistake in my code can you correct me? i will send my code. to this mail
i wrote the code in dropdownusercontrol.ascx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace UserControlsExamples
{
public partial class DropDownUserControl : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DDColors_SelectedIndexChanged(object sender, EventArgs e)
{
LabelUserControl lblCtrl = (LabelUserControl)(FindControl("labelcontrol"));
Label lbl = (Label)(lblCtrl.FindControl("labelcontrol"));
//lbl.BackColor = System.Drawing.Color.FromName(DDColors.SelectedValue);
lbl.Text = DDColors.SelectedItem.Text;
}
}
}

//The code in LabelUsercontrol.ascx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace UserControlsExamples
{
public partial class LabelUserControl : System.Web.UI.UserControl
{
public Label Display_Label
{
get
{
return this.DisplayLabel;
}
set
{
this.DisplayLabel = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
}
}
}

can you look at this code and tell me what i did wrong
and i didnt write any code in .aspx.cs file