ArrayList in ViewState Add & Read Foreach?

I would like to add items to an ArrayList on Gridview checkbox click events to save the Gridview ID column value. How do I code it?

(ArrayList)ViewState["arrayListInViewState"];

protected void CheckBox1_OnCheckChanged(Object sender, EventArgs e)
{
      GridViewRow rw = (GridViewRow)((Control)sender).NamingContainer;
      ArrayList.Add(GridView1.DataKeys[rw.RowIndex]["id"].ToString());
            (ArrayList)ViewState["arrayListInViewState]"
}

protected void txtData_OnTextChanged(object sender, EventArgs e)
{
      GridViewRow rw = (GridViewRow)((Control)sender).NamingContainer;
      ArrayList.Add(GridView1.DataKeys[rw.RowIndex]["id"].ToString());
            (ArrayList)ViewState["arrayListInViewState]"
}

Also unsure how to foreach the arraylist later

protected void btnSubmit_Click(object sender, EventArgs e)
{
    //foreach...
}
pointemanAsked:
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Miguel OzSoftware EngineerCommented:
Use a generic list (ArrayList is  obsolete and it leads to performance issues -box/unbox)

public List<string> MyIdList

{

    get { if (ViewState["arrayListInViewState"] == null)
                ViewState["arrayListInViewState"] = new List();
            return (List<string>)(ViewState["arrayListInViewState"]; }

    set { ViewState["arrayListInViewState"] = value; }
}


protected void CheckBox1_OnCheckChanged(Object sender, EventArgs e)
{
      GridViewRow rw = (GridViewRow)((Control)sender).NamingContainer;
      MyIdList.Add(GridView1.DataKeys[rw.RowIndex]["id"].ToString());
}

protected void txtData_OnTextChanged(object sender, EventArgs e)
{
      GridViewRow rw = (GridViewRow)((Control)sender).NamingContainer;
      MyIdList.Add(GridView1.DataKeys[rw.RowIndex]["id"].ToString());
}

//forearch sample
foreach (string prime in MyIdList) // Loop through List with foreach
      {
          // use prime
      }




Check:
http://www.dotnetperls.com/list
http://www.karpach.com/property-in-viewstate.htm
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pointemanAuthor Commented:
Very nice, that gets me off to good start
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