How to get the HTML name attribute of ASP.Net Control

//Function to get the HTML name of the server control from the Client Id
// Parameters:
// clientId - Control.ClientId
// serverId - Control.id
private string GetHTMLNameById(string clientId, string serverId)
{
int pos = serverId.IndexOf('_');
string HTMLName = "";
if(pos >= 0)
{
pos = clientId.IndexOf(serverId);
HTMLName = clientId.Remove(pos, serverId.Length);
HTMLName = HTMLName.Replace('_', '$');
HTMLName += serverId;
}
else
HTMLName = clientId.Replace('_', '$');
return HTMLName;
}