repeater and checkboxes

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C#

ASP.NET

ASPX code:

<td class="field1"><asp:CheckBox ID="CheckBox1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonnelSummary_Cleveland_Resident") %>'/></td>
        <td class="field1"><asp:CheckBox ID="CheckBox2" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "PersonnelSummary_Present") %>' /></td>
<asp:Button ID="btnAddAnother" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Button") %>' CommandName='<%# DataBinder.Eval(Container.DataItem, "Button") %>' />

cs code:

public void Rptr_ItemCommand(Object source, RepeaterCommandEventArgs e)
{
int Total = Rptr.items.Count;
if (e.CommandName == "Add")
{
Total = Total + 1; 
AddColumns();
foreach (Repeater item in Rptr.Items)
{
CheckBox PSR = ((CheckBox)item.FindControl("txtPSR"));
CheckBox PSP = ((CheckBox)item.FindControl("txtPSP"));
Button btnAdd = ((Button)item.FindControl("btnAddAnother"));
}
tb.Rows.Add(PSR,PSP, "Add");
}
else if (e.CommandName == "Remove")
   {
     Total = Total -1;
     CheckBox PSR = ((CheckBox)item.FindControl("txtPSR"));
     CheckBox PSP = ((CheckBox)item.FindControl("txtPSP"));
     Button btnAdd = ((Button)item.FindControl("btnAddAnother"));
   }
}

public void AddColumns()
{
 tb.Columns.Add("PSR", typeof(bool));
   tb.Columns.Add("PSP", typeof(bool));
   tb.Columns.Add("Button")
}

public void ButtonAdd_Click(object sender, EvenetArgs args)
{
AddColumns();
tb.Rows.Add(bool, bool, "Add");
btnAddAnother.Visible = false;
}

I have two problems:
P1: When a user click the add button, I get error on the check boxes. I change the bool to 1 or 0 it comes up true or false. When I click on the checkboxes to see if the change the answer is no.

P2: When the user click to remove it remove a dynamically created the very top