Binding List To GridView And Upadte GridView

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C#

ASP.NET

C#4.0

Hello Friends,
First Of all Happy Valentine Day to All of You.
now come to my question
in my page i am binding a gridview using List.
i have different fields on my page and storing those fields values into list and binding it with a grid
it is working well but now i want to update gridview using checkbox in gridview,on clicking on checkbox the associated values in that row comes on the different fields and on button save click gridview should be updated.
i don't know how to achieve it.
kindly help me fix this issue.

Thanks In Advance
My HTML Code is like this

<table class="tblPopUp">
<tr>
<td>
<asp:Label ID="lblCaste" CssClass="Label" runat="server" Text="Caste"></asp:Label>
</td>
<td>
 <asp:DropDownList ID="ddlCaste" runat="server" CssClass="Dropdownlist myddlinPopUp"></asp:DropDownList>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblNo_OfPosition" CssClass="Label" runat="server" Text="No Of Position"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtNoOfPositioninPopUp" runat="server" CssClass="TextBox mytextboxinPopUp"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblMinAge" CssClass="Label" runat="server" Text="Min Age"></asp:Label>
 </td>
 <td>
 <asp:TextBox ID="txtMinAge" runat="server" CssClass="TextBox mytextboxinPopUp"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblMaxAge" CssClass="Label" runat="server" Text="Max Age"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtMaxAge" runat="server" CssClass="TextBox mytextboxinPopUp"></asp:TextBox>
  </td>
</tr>
<tr>                    
<td>
<asp:Button ID="btnSaveInPopUpReservation" runat="server" CssClass="button" Text="Save" OnClick="btnSaveInPopUpReservation_Click" />
 </td>
</tr>
</table>
<asp:GridView ID="gridReservationDetails" runat="server" GridLines="Both" AutoGenerateColumns="false" CssClass="gridview" ShowHeaderWhenEmpty="true">
<Columns>
<asp:TemplateField HeaderStyle-HorizontalAlign="Left">
<HeaderTemplate>
<asp:CheckBox ID="checkAll" runat="server" onclick="checkAll(this);" />
 </HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" onclick="Check_Click(this)" />
 </ItemTemplate>
  <HeaderStyle Font-Bold="False" />
 <ItemStyle Font-Bold="False" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Sl. No" HeaderStyle-HorizontalAlign="Left" ItemStyle-CssClass="item">
<ItemTemplate>
 <%# Container.DataItemIndex + 1 %>
 </ItemTemplate>
</asp:TemplateField>
 <asp:BoundField HeaderText="Caste" DataField="casteName" ItemStyle-CssClass="item" HeaderStyle-HorizontalAlign="Left" />
<asp:BoundField HeaderText="No Of Position" DataField="NoOfPosition" ItemStyle-CssClass="item" HeaderStyle-HorizontalAlign="Left" />
<asp:BoundField HeaderText="Min Age" DataField="MinAge" ItemStyle-CssClass="item" HeaderStyle-HorizontalAlign="Left" />
<asp:BoundField HeaderText="Max Age" DataField="MaxAge" ItemStyle-CssClass="item" HeaderStyle-HorizontalAlign="Left" />

</Columns>
</asp:GridView>

my code behind for binding list values is like this

public class CommonHRMS_PositionRequisitionReservationDetails
    {
        public int casteID { get; set; }
        public string casteName { get; set; }
        public int NoOfPosition { get; set; }
        public int MaxAge { get; set; }
        public int MinAge { get; set; }
    }

protected List<CommonHRMS_PositionRequisitionReservationDetails> FillReservation()
       {
           List<CommonHRMS_PositionRequisitionReservationDetails> lst = new List<CommonHRMS_PositionRequisitionReservationDetails>();
           List<CommonHRMS_PositionRequisitionReservationDetails> lstPrevious = new List<CommonHRMS_PositionRequisitionReservationDetails>();
           lstPrevious = (List<CommonHRMS_PositionRequisitionReservationDetails>)Session["cprrd"];
           if (lstPrevious != null)
           {
               CommonHRMS_PositionRequisitionReservationDetails obj = new CommonHRMS_PositionRequisitionReservationDetails();
               obj.casteID = int.Parse(ddlCaste.SelectedValue);
               obj.casteName = ddlCaste.SelectedItem.ToString();
               obj.NoOfPosition = int.Parse(txtNoOfPositioninPopUp.Text);
               obj.MaxAge = int.Parse(txtMaxAge.Text);
               obj.MinAge = int.Parse(txtMinAge.Text);
               lstPrevious.Add(obj);
               Session["cprrd"] = lstPrevious;
               return lstPrevious;
           }
           else
           {
               CommonHRMS_PositionRequisitionReservationDetails obj = new CommonHRMS_PositionRequisitionReservationDetails();
               obj.casteID = int.Parse(ddlCaste.SelectedValue);
               obj.casteName = ddlCaste.SelectedItem.ToString();
               obj.NoOfPosition = Convert.ToInt32(txtNoOfPositioninPopUp.Text);
               obj.MaxAge = Convert.ToInt32(txtMaxAge.Text);
               obj.MinAge = Convert.ToInt32(txtMinAge.Text);
               lst.Add(obj);
               Session["cprrd"] = lst;
               return lst;
           }
       }

protected void btnSaveInPopUpReservation_Click(object sender, EventArgs e)
      {
        List<CommonHRMS_PositionRequisitionReservationDetails> lst = FillReservation();
        gridReservationDetails.DataSource = lst;
        gridReservationDetails.DataBind();
      }