Inserting Data in Drop Down List Based on two or more conditions .An Extra Space is Display Bellow all Items in Drop down list Which is not consider an item Because of Validation Working. How to remove the free Space?

 The code is Given Bellow:-

private void loadUserGroup()
{
    CUsers objCUsers=new CUsers();
    ddlUserGroup.Items.Clear();
    ddlUserGroup.Items.Insert(0, new ListItem("", "0"));
    ddlUserGroup.Items.Insert(0, new ListItem("Admin", "2"));
    string suseid= User.Identity.Name;
    int iUserID = Convert.ToInt32(suseid.ToString());
    long iUserParent = objCUsers.SelectUserParent(iUserID);
    int iadID=objCUsers.SelectUserIDforAdmin(ddlUserGroup.Items[0].Text);
    if(iUserParent==0 || iUserParent==null)
    {
        ddlUserGroup.Visible = false;
        lblUserGroup.Visible = false;
    }
    else if (iUserParent == iadID)
    {
        ddlUserGroup.Visible = true;
        lblUserGroup.Visible = true;
        ddlUserGroup.Items.RemoveAt(0);
        ddlUserGroup.Items.Insert(0, new ListItem("Dealer", "4"));
        ddlUserGroup.Items.Insert(1, new ListItem("Admin", "3"));//Similar To Admin
    }
    else
    {
        long iUserGroup = objCUsers.SelectUserGroup(iUserID);
        if(iUserGroup==4)
        {
            ddlUserGroup.Items.Insert(0, new ListItem("Company", "5"));      
        }
        else if(iUserGroup==3)
        {
            ddlUserGroup.Items.Insert(0, new ListItem("Admin", "3"));
        }
        else if (iUserGroup == 5)
        {         
            ddlUserGroup.Items.Insert(0, new ListItem("Company", "5"));
        }      
    }  
}