Display GridView Selected Row in FormView of another page using VB.Net

Hi zoom,

 I have created a sample which full fill your requirement

Default4.aspx

<div>
    <asp:GridView ID="gvCustomers" runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:HyperLinkField HeaderText="Details" Text="Details" DataNavigateUrlFields="CustomerID"
                DataNavigateUrlFormatString="OrderDetail.aspx?CustomerID={0}" />
            <asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="true" />
            <asp:BoundField DataField="ContactName" HeaderText="ContactName" />
            <asp:BoundField DataField="City" HeaderText="City" />
        </Columns>
    </asp:GridView>
</div>

Default4.aspx.vb

Protected Sub Page_Load(sender As Object, e As EventArgs)
    If Not IsPostBack Then
        Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Dim con As New SqlConnection(constr)
        Dim cmd As New SqlCommand("SELECT TOP 10 CustomerID,ContactName,City FROM Customers", con)
        Dim sda As New SqlDataAdapter(cmd)
        Dim dt As New DataTable()
        sda.Fill(dt)
        gvCustomers.DataSource = dt
        gvCustomers.DataBind()
    End If
End Sub

OrderDetail.aspx

<div>
    <asp:FormView ID="fvOrderDetails" runat="server" AllowPaging="true" OnPageIndexChanging="fvOrderDetails_PageIndexChanging">
        <ItemTemplate>
            <table border="0" cellpadding="0" cellspacing="0">
                <tr>
                    <td>
                        CustomerID:
                    </td>
                    <td>
                        <%# Eval("CustomerID")%>
                    </td>
                </tr>
                <tr>
                    <td>
                        OrderID:
                    </td>
                    <td>
                        <%# Eval("OrderID")%>
                    </td>
                </tr>
                <tr>
                    <td>
                        OrderDate:
                    </td>
                    <td>
                        <%# Eval("OrderDate")%>
                    </td>
                </tr>
                <tr>
                    <td>
                        ShipName:
                    </td>
                    <td>
                        <%#Eval("ShipName") %>
                    </td>
                </tr>
            </table>
        </ItemTemplate>
    </asp:FormView>
</div>

OrderDetail.aspx.vb

Protected Sub Page_Load(sender As Object, e As EventArgs)
    If Not IsPostBack Then
        BindFormView()
    End If
End Sub

Private Sub BindFormView()
    Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim con As New SqlConnection(constr)
    Dim cmd As New SqlCommand("SELECT [CustomerID],[OrderID],[OrderDate],[ShipName] FROM [Orders] WHERE CustomerID= '" + Request.QueryString("CustomerID") + "'", con)
    Dim sda As New SqlDataAdapter(cmd)
    Dim dt As New DataTable()
    sda.Fill(dt)
    fvOrderDetails.DataSource = dt
    fvOrderDetails.DataBind()
End Sub

Protected Sub fvOrderDetails_PageIndexChanging(sender As Object, e As FormViewPageEventArgs)
    fvOrderDetails.PageIndex = e.NewPageIndex
    BindFormView()
End Sub

Protected Sub Page_Load(sender As Object, e As EventArgs)
	If Not IsPostBack Then
		Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
		Dim con As New SqlConnection(constr)
		Dim cmd As New SqlCommand("SELECT TOP 10 CustomerID,ContactName,City FROM Customers", con)
		Dim sda As New SqlDataAdapter(cmd)
		Dim dt As New DataTable()
		sda.Fill(dt)
		gvCustomers.DataSource = dt
		gvCustomers.DataBind()
	End If
End Sub

ScreenShot