asp.Net <control> does not exist in current context
<p>I am facing a small big problem. I have taken a dropdownList control and ID is
<code>"drpDownCountries</code>" in ASP.Net project. The problem is that "The dropdownlist control 
is placed on page, in the code behind file of c#, while typing the control name <code>"drpDownCountries"</code>, this control ID is listed in object member list. 
     But, in compiling the project I am getting following error.</p>

<p><em><strong>Error : - The name 'drpDownCountries' does not exist in the current context</strong></em>.</p>

<p>I have checked this thing on different machines too. But same error is occurring. I do not understand what is the reason behind that.</p>
