Use a checkbox to edit gridview

I'm trying to use a checkbox to edit items in a grid view.  Instead of the user clicking on a edit hyperlink to edit the grid I want them to select a check box.  Below is the code that I'm using.  What I want to do is make it to where if a user clicks on a check box the edit function executes where the user can update the information being pulled from the database to populate the grid.  How can I do this?

 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <asp:GridView ID="GridView1" runat="server" OnRowEditing="EditJob" OnRowUpdating="UpdateJob"
                    OnRowCancelingEdit="CancelEdit" OnRowDeleting="delete" AutoGenerateColumns="False"
                    CellPadding="4" DataKeyNames="job_id" 
            OnPageIndexChanging="GridView1_PageIndexChanging" DataSourceID="sqlJobList" ShowFooter="True" 
                    ForeColor="#333333" GridLines="None" Height="148px" Width="866px"  
            AllowSorting="True"> 
        <RowStyle BackColor="#E3EAEB" />
        <Columns>
             <asp:CommandField ShowDeleteButton="True" ShowEditButton="false" />
             <asp:TemplateField ShowHeader="False">
                <ItemTemplate>
                    <asp:LinkButton ID="btnView" runat="server" CausesValidation="False" 
                        CommandArgument='<%# Eval("job_id") %>' OnCommand="viewPosting" Text="View"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>

 <asp:TemplateField HeaderText="Job ID" InsertVisible="False" 
                SortExpression="job_id" Visible="False">
                <EditItemTemplate>
                    <asp:Label ID="lbljob_id" runat="server" Text='<%# Bind("job_id") %>'></asp:Label>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="lbljob_id" runat="server" Text='<%# Bind("job_id") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>

 <asp:TemplateField HeaderText="Title">
                <ItemTemplate>
                    <asp:Label ID="lbltitle" runat="server" Text='<%# Eval("title") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtTitle" runat="server" Text='<%# Eval("title") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtTitle" runat="server"></asp:TextBox>
                </FooterTemplate>
            </asp:TemplateField>


            <asp:TemplateField HeaderText="Region">
                <ItemTemplate>
                    <asp:Label ID="lblRegion" runat="server" Text='<%# Eval("Region") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtRegion" runat="server" Text='<%# Eval("Region") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtRegion" runat="server"></asp:TextBox>
                </FooterTemplate>
            </asp:TemplateField>
            
             <asp:TemplateField HeaderText="Open Posting">
                <ItemTemplate>
                    <asp:Label ID="lblOpen_Check" runat="server" Text='<%# Eval("open_check") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList1" runat="server" 
                        SelectedValue='<%# Bind("open_check") %>'>
                        <asp:ListItem Value="y">Yes</asp:ListItem>
                        <asp:ListItem Value="n">No</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <FooterTemplate>
                     <asp:DropDownList ID="DropDownList1" runat="server" 
                        SelectedValue='<%# Bind("open_check") %>'>
                        <asp:ListItem Value="y">Yes</asp:ListItem>
                        <asp:ListItem Value="n">No</asp:ListItem>
                    </asp:DropDownList>
                </FooterTemplate>
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Open ID" InsertVisible="False" 
                SortExpression="openjob_id" Visible="False">
                <EditItemTemplate>
                    <asp:Label ID="lblopenjob_id" runat="server" Text='<%# Bind("openjob_id") %>'></asp:Label>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="lblopenjob_id" runat="server" Text='<%# Bind("openjob_id") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>



             <asp:TemplateField HeaderText="Close Date">
                <ItemTemplate>
                    <asp:Label ID="lblClose_Date" runat="server" Text='<%# Eval("close_date") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtclose_date" runat="server" Text='<%# Eval("close_date") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtclose_date" runat="server"></asp:TextBox>
                </FooterTemplate>
            </asp:TemplateField>

 <%--Use checkbox to edit items--%>
            <asp:TemplateField HeaderText="Action CheckBox">
            <ItemTemplate>
                <asp:CheckBox ID="chkSelect" runat="server" OnCheckedChanged="EditJob" AutoPostBack="true" />
            </ItemTemplate>
            <HeaderTemplate>
                <input id="chkSelect" name="Select All" onclick="SelectAll(this)" type="checkbox"
                runat="server" />All
            </HeaderTemplate>
            <FooterTemplate>
                <asp:Button ID="btnadd" runat="server" Text="Add" OnClick="AddNewJob" />
                </FooterTemplate>

</asp:TemplateField>
            </Columns>
    </asp:GridView>
    </ContentTemplate>
    </asp:UpdatePanel>


<!--Here is the code behind part of the page

  '**insert new Job in gridview**

    Protected Sub AddNewJob(ByVal sender As Object, ByVal e As EventArgs)
        Dim Title As String = DirectCast(GridView1.FooterRow.FindControl("txtTitle"), TextBox).Text
        Dim Region As String = DirectCast(GridView1.FooterRow.FindControl("txtRegion"), TextBox).Text
        Dim open_check As String = DirectCast(GridView1.FooterRow.FindControl("DropDownList1"), DropDownList).SelectedValue

        ' Dim close_date As String = DirectCast(GridView1.FooterRow.FindControl("DropDownList1"), DropDownList).SelectedValue
        Dim cmd As New SqlCommand()
        cmd.CommandType = CommandType.Text
        cmd.CommandText = "insert into tblJobPostings(Title,Region,open_check) values(@Title,@Region,@open_check); SELECT  job_id, [openjob_id],[title], [open_check], [region],[close_date] FROM (SELECT j.job_id, [openjob_id],[title], [open_check], [region],[close_date],ROW_NUMBER() OVER(PARTITION BY j.job_id ORDER BY [close_date] DESC) AS RowNo FROM [tblJobPostings] j LEFT OUTER JOIN [tblOpenJobs] hON j.job_id = h.job_id  )sub WHERE sub.RowNo = 1"
        cmd.Parameters.Add("@Title", SqlDbType.VarChar).Value = Title
        cmd.Parameters.Add("@Region", SqlDbType.VarChar).Value = Region
        cmd.Parameters.Add("@open_check", SqlDbType.VarChar).Value = open_check
        'cmd.Parameters.Add("@close_date", SqlDbType.VarChar).Value = close_date
        cmd.Connection = con
        con.Open()
        cmd.ExecuteNonQuery()
        con.Close()
        binddata()
    End Sub

    'Function to bind data
    Private Sub binddata()

        con.Open()
        Dim query As New String("SELECT  job_id, [openjob_id],[title], [open_check], [region],[close_date] FROM (SELECT j.job_id, [openjob_id],[title], [open_check], [region],[close_date], ROW_NUMBER() OVER(PARTITION BY j.job_id ORDER BY [close_date] DESC) AS RowNo FROM [tblJobPostings] j LEFT OUTER JOIN [tblOpenJobs] h ON j.job_id = h.job_id  ) sub WHERE sub.RowNo = 1 ")
        Dim da As New SqlDataAdapter(query, con)
        Dim ds As New DataSet()
        da.Fill(ds)
        If ds.Tables(0).Rows.Count > 0 Then
            'GridView1.DataSource = ds
            GridView1.DataBind()
            con.Close()
        End If
    End Sub

    '***to edit gridview**
    Protected Sub EditJob(ByVal sender As Object, ByVal e As GridViewEditEventArgs)
        GridView1.EditIndex = e.NewEditIndex
        binddata()
    End Sub

    '**to cancel edit**
    Protected Sub CancelEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs)
        GridView1.EditIndex = -1
        binddata()
    End Sub

    '**to delete from gridview from database**
    Protected Sub delete(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
        con.Open()
        Dim cmd As New SqlCommand("delete from tblJobPostings where job_id=@job_id", con)
        cmd.Parameters.Add("@job_id", SqlDbType.Int).Value = DirectCast(GridView1.Rows(e.RowIndex).FindControl("lbljob_id"), Label).Text
        cmd.ExecuteNonQuery()
        con.Close()
        binddata()
    End Sub

    '**to update from gridview and database**
    Protected Sub UpdateJob(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
        Dim job_id As Integer = DirectCast(GridView1.FooterRow.FindControl("lbljob_id"), Label).Text
        Dim openjob_id As Integer = DirectCast(GridView1.FooterRow.FindControl("lblopenjob_id"), Label).Text
        Dim close_date As Date = DirectCast(GridView1.FooterRow.FindControl("txtclose_date"), TextBox).Text
        Dim open_check As String = DirectCast(GridView1.FooterRow.FindControl("DropDownList1"), DropDownList).SelectedValue
        'execute store procedure
        con.Open()
        Dim cmd As New SqlCommand("spJobPostings", con)
        cmd.CommandType = CommandType.StoredProcedure

        cmd.Parameters.AddWithValue("@job_id", CInt(job_id))
        cmd.Parameters.AddWithValue("@openjob_id", CInt(openjob_id))
        cmd.Parameters.AddWithValue("@close_date", CDate(close_date))
        cmd.Parameters.AddWithValue("@open", CStr(open_check))


    End Sub

   Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
        GridView1.PageIndex = e.NewPageIndex
        binddata()
    End Sub

    Protected Sub dvJobs_ItemInserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewInsertedEventArgs) Handles dvJobs.ItemInserted
        GridView1.DataBind()

    End Sub

    Protected Sub dvJobs_ItemUpdated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewUpdatedEventArgs) Handles dvJobs.ItemUpdated
        GridView1.DataBind()
    End Sub


    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If Not Page.IsPostBack Then
            'tabMenu.Tabs("3").Selected = True
            binddata()
        End If

    End Sub

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