Specifying constant value in the gridview hyperlink - asp.net

Question

I have a gridview with a HyperLinkField column where the DataNavigateUrlFormatString is as following:
DataNavigateUrlFormatString="DetailedPage.aspx?OrderNo={0}"
I would like to add to the above DataNavigateUrlFormatstring another value – constant - so that the called page (DetailedPage can get both the value of OrderNo (passed dynamically) and the same value for all rows.
For example, the url would be something like:
DetailedPage.aspx?OrderNo=100&filename=’myfilename.doc’
Note, again that the name ‘myfilename.doc’ is the same for all rows but will be known in the OnLoad of the page. Ideally I would like the second value (e.g. myfilename.doc) to be hidden from the URL
but if this is not possible, it will still work.
How can I do it?

Answer 1

Use a TemplateField with a HyperLink control inside and then in the RowDataBound event in code-behind, just set the NavigateUrl property to the value, like this:
Markup:
<asp:GridView id="GridView1" runat="server"
OnRowDataBound="GridView1_RowDataBound">
<Columns>
...Other columns here...
<asp:TemplateField>
<ItemTempalte>
<asp:HyperLink id="HyperLink1" runat="server" Text="Details" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Code-behind:
protected void GridView1_RowDataBound(Object sender, GridViewRowEventArgs e)
{
// Only interact with the data rows, ignore header and footer rows
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Find the hyperlink control by ID
var theHyperLink = e.Row.FindControl("HyperLink1") as HyperLink;
// Verify we found the hyperlink before we try to use it
if(theHyperLink != null)
{
// Set the NavigateUrl value here
theHyperLink.NavigateUrl = String.Format("DetailedPage.aspx?OrderNo={0}&filename='{1}'", theOrderNumber.ToString(), theFileName);
}
}
}
Note: theOrderNumber and theFileName would be values determined upon load of the page from the database, for example.