My problem is on page refresh the button value is being saved again. I want it to save only on button click not on page refresh.

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ASP.NET

HTML

SQL-Server-2008R2

Actually I have two button clicks:-

protected void Button4_Click1(object sender, EventArgs e)
    {
        //if (!IsPostBack)
        if (CheckBox1.Checked == true)
            bindgrid();

    }

    protected void Button5_Click(object sender, EventArgs e)
    {

        if (CheckBox2.Checked == true)
            busbindgrid();
    }

Now I am getting problem on page refresh, page load.

Although I find this somewhere on net , but it's still not working:-

Boolean IsPageRefresh;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ViewState["postids"] = System.Guid.NewGuid().ToString();
            Session["postid"] = ViewState["postids"].ToString();
        }
        else
        {
            if (ViewState["postids"].ToString() != Session["postid"].ToString())
            {
                IsPageRefresh = true;
            }
            Session["postid"] = System.Guid.NewGuid().ToString();
            ViewState["postids"] = Session["postid"].ToString();
        }
    }

Am I doing something wrong?? Please HELP!!