按需要提升管理权限

if (!IsRunAsAdmin())
{
    // 使用管理员
    ProcessStartInfo proc = new ProcessStartInfo();
    proc.UseShellExecute = true;
    proc.WorkingDirectory = Environment.CurrentDirectory;
    proc.FileName = Application.ExecutablePath;
    proc.Verb = "runas";

    try
    {
        Process.Start(proc);
    }
    catch
    {
        // 拒绝提升权限则返回
        return;
    }
    Environment.Exit(0);
}
/// <summary>
/// The function checks whether the current process is run as administrator.
/// In other words, it dictates whether the primary access token of the
/// process belongs to user account that is a member of the local
/// Administrators group and it is elevated.
/// 判断当前账户是否为管理员账户
/// </summary>
/// <returns>
/// Returns true if the primary access token of the process belongs to user
/// account that is a member of the local Administrators group and it is
/// elevated. Returns false if the token does not.
/// </returns>
internal static bool IsRunAsAdmin()
{
    WindowsIdentity id = WindowsIdentity.GetCurrent();
    WindowsPrincipal principal = new WindowsPrincipal(id);
    return principal.IsInRole(WindowsBuiltInRole.Administrator);
}

代码示例详见：UnicodeToGB2312 相关代码转自：CodeProject