Unable to assign int value to Hidden Field

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I am trying to assign an int variable value to a hidden field value, but its not working. Can anyone help? 

Below is my code -

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPost)
    {
        int Id= 0;
        if (Request.QueryString["Id"] != null && Request.QueryString["Id"] != "")        {
            MyId = Convert.ToInt32(Request.QueryString["Id"]);
        }
        else
        {
            Id = -1;
        }

        hiddenId.Value =Id;
    }
}