passing an ID between pages - asp.net

Question

I have a Default.aspx page in which I have bind a Grid. In the Grid is a button named Details.
I also have a Details.aspx which has a GridView. If I click the button that exist in Default.aspx, there appears an Details.aspx page which appears empty.
When click the Detail button of a specific row, there appears the details of that button clicked. I am not understanding on how to pass the ID to Details.aspx.
Can anybody guide me to this please?
Details.aspx
<asp:GridView ID="DetailsGridView" runat="server" BackColor="White" AutoGenerateColumns="false"
BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="ID"
ForeColor="Black" GridLines="Vertical">
<FooterStyle BackColor="#CCCC99" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
Default.aspx:
<Columns>
<asp:BoundField HeaderText="First Name" DataField="FirstName" />
<asp:BoundField HeaderText="Last Name" DataField = "LastName" />
<asp:BoundField HeaderText="HomePhoneNumber" DataField="HomePhoneNumber" />
<asp:TemplateField HeaderText="ViewDetails">
<ItemTemplate>
<asp:Button ID="Deatils" runat="server" Text="Details" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Actions">
<ItemTemplate>
<asp:Button ID="Modify" runat="server" Text="Modify" />
<asp:Button ID="Delete" runat="server" Text="Delete" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<FooterStyle BackColor="#CCCC99" />
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
</div>
JavaScript
<script type="text/javascript">
function viewProfile(index)
{
var GridID = document.getElementById("PersonGridView");
var row=GridID.rows[parseInt(index)+1];
window.open('Details.aspx?coaid'+row);
}
</script>
Code Behind of Default.aspx:
protected void PersonGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
var DataKeys = PersonGridView.DataKeys[e.Row.RowIndex];
DataKeys.Value.ToString();
var ID = DataKeys["ID"].ToString();
Button btnDetails = (Button)e.Row.FindControl("Deatils");
Button btnModify = (Button)e.Row.FindControl("Modify");
Button btnDelete = (Button)e.Row.FindControl("Delete");
btnModify.CommandName = "Modify";
btnDelete.CommandName = "Delete";
btnDetails.CommandName = "Deatils";
btnDelete.CommandArgument = btnModify.CommandArgument = btnDetails.CommandArgument = string.Format("{0}", ID);
btnDetails.Attributes["onclick"] = string.Format("viewProfile({0}); return false;", e.Row.RowIndex);
}
}

Answer 1

EDIT: I've modified my example to not use a HyperLink and instead will build a LinkButton that can navigate to your Details.aspx page passing the ID value in the QueryString:
Default.aspx:
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton CommandName="Details" CommandArgument='<%# Eval("ID") %>' Text="Details" runat="server" />
</ItemTemplate>
</asp:TemplateField>
Default.aspx.cs:
protected void PersonGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Details")
{
Server.Transfer("Details.aspx?ID=" + e.CommandArgument.ToString());
}
}

Answer 2

On the Grid when you click the button
do the following
public protected sub Button_Click(EventArgs e)
{
if (grid.SelectedItem != null)
{
var selectedRow = grid.SelectedItem ;
// do what ever you want to Selected Row that may be binding it to another Form etc.
}
Do the same for OnSelectedEvent if you want to do it that way instead.
public protected sub OnSelectedEvent_Click(EventArgs e)
{
if (grid.SelectedItem != null)
{
var selectedRow = grid.SelectedItem ;
// do what ever you want to Selected Row that may be binding it to another Form etc.
}