Make bound field in grid like HyperLinkField - html

Question

I have a nested gridview as shown below. I populate the gridview from a stored procedure and method in my DAL/BLL layers. This works fine and data is returned to my nested gridview as I expect.
What I'd like to do though, is have the boundfield (VisitTypeId) in my nested gridview as a hyperlink, so the user can click on it and be redirected to the related 'Visit' for the Patient (in other words, 'where ID={0} and VisitTypeId={0}').
I'm certain this must be possible, but can't find a way to do it. Can someone please help?
Markup:
<asp:GridView ID="gvPatients" runat="server" AutoGenerateColumns="False" DataSourceID="odsPatients" OnRowDataBound="gvVisits_RowDataBound"
DataKeyNames="ID" AllowPaging="True" CssClass="interactTable" CellPadding="4"
AllowSorting="True" meta:resourcekey="gvPersonsResource1">
<HeaderStyle CssClass="header" />
<RowStyle CssClass="row"/>
<Columns>
<asp:TemplateField Visible="False">
<ItemTemplate>
<asp:Label ID="lblID" runat="server" Text='<%# Eval("ID")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:Boundfield DataField="ID" HeaderText="ID" />
<asp:Boundfield DataField="Forename" HeaderText="Forename" />
<asp:Boundfield DataField="Surname" HeaderText="Surname" />
<asp:Boundfield DataField="DoB" HeaderText="DoB" DataFormatString="{0:dd/MM/yyyy}" />
<asp:TemplateField HeaderText="Visits">
<ItemTemplate>
<asp:GridView ID="gvVisits" runat="server" AutoGenerateColumns="false" BorderWidth="0" ShowHeader="false" >
<Columns>
<%-- <asp:BoundField DataField="PatientID" Visible="false" /> --%>
<asp:BoundField DataField="VisitTypeID" />
</Columns>
</asp:GridView>
</ItemTemplate>
</asp:TemplateField>
<asp:HyperLinkField DataNavigateUrlFields="ID" DataNavigateUrlFormatString="~/AddEditPatient.aspx?ID={0}" HeaderText="Edit" Text="Edit" />
</Columns>
</asp:GridView>
DAL:
Public Shared Function GetVisitType(PatientId As Integer) As DataSet
Using myConnection As New SqlConnection(AppConfiguration.ConnectionString)
Using myCommand As New SqlCommand("SPGetVisitType", myConnection)
myCommand.CommandType = CommandType.StoredProcedure
myCommand.Parameters.AddWithValue("PatientID", PatientId)
myConnection.Open()
Dim ds As New DataSet()
Using myAdapter As New SqlDataAdapter(myCommand)
myAdapter.Fill(ds)
Return ds
End Using
myConnection.Close()
End Using
End Using
End Function
BLL:
Public Shared Function GetVisitType(ByVal PatientId As Integer) As DataSet
Dim ds As DataSet = ScreeningTestDAL.Visit.GetVisitType(PatientId)
Return ds
End Function
Codebehind:
Protected Sub gvVisits_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim gv As GridView = DirectCast(e.Row.FindControl("gvVisits"), GridView)
Dim PatientId As Integer = Convert.ToInt32(e.Row.Cells(1).Text)
Dim ds1 As DataSet = ScreeningTestBLL.VisitManager.GetVisitType(PatientId)
gv.DataSource = ds1
gv.DataBind()
End If
End Sub