[RESOLVED] Checkboxes in my gridview being unchecked don't remove value from Dictionary

We just uncovered an odd bug in this gridview with checkboxes. (original thread:
http://forums.asp.net/post/4691898.aspx) The idea is to store the checkboxes that are checked into a dictionary that has (username, boolean) in this case the key is username, the value is boolean. As I step
through the checkbox state, I'm wanting to make it so when someone unchecks a username checkbox, it gets stripped from the checkbox dictionary. It doesn't seem to be working. I'm using the viewstate to try to keep track of which checkboxes are checked. I guess
this is what I get for trying to use GridView with paging, ugh! Here's the code:

 

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Label lblName = ((Label)e.Row.FindControl("lblName"));
            DataRowView _dv = (DataRowView)e.Row.DataItem;
            UserInformation _u = new UserInformation((string)_dv.Row["USER"], false);
            if (_u.Name != null)
            {
                lblName.Text = _u.Name;
                _u = null;
            }
            else
            {
                e.Row.Visible = false;
            }
            String id = (String)GridView1.DataKeys[e.Row.RowIndex].Value;
            if (!_checkBoxDictionary.ContainsKey(id))
            {
                _checkBoxDictionary.Add(id, false);
            }
            CheckBox checkBox = (CheckBox)e.Row.FindControl("chkSelect");
            checkBox.Checked = _checkBoxDictionary[id];
        }
    }

    protected override void LoadViewState(object savedState)
    {
        base.LoadViewState(savedState);
        _checkBoxDictionary = (Dictionary)ViewState["CheckBoxDictionary"];
    }

    protected override object SaveViewState()
    {
        ViewState["CheckBoxDictionary"] = _checkBoxDictionary;
        return base.SaveViewState();
    }

    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        foreach (GridViewRow row in GridView1.Rows)
        {
            String id = (String)GridView1.DataKeys[row.RowIndex].Value;
            CheckBox checkBox = (CheckBox)row.FindControl("chkSelect");
            _checkBoxDictionary[id] = checkBox.Checked;
        }
    }

Is this what you are trying to achieve! http://dotnetprof.blogspot.in/2012/11/persist-gridview-row-selection-during.html

Solved the problem with a combination of what I found there and a little of my own coding handywork. Primarily, the answer to my problem was found at

http://www.codeproject.com/Articles/202938/How-to-select-multiple-records-from-the-GridView-a