Selectively hiding a HyperLinkField in a gridview in a control - asp.net

Question

I have a control which I can call to populate the top of a aspx page with demographic information as follows.
<div runat="server" id="headerline" style="width:100%; background-color:#FFFFCC; border-color: #FFFFCC; " >
<asp:GridView ID="GridView1" skinID="headerline" runat="server" DataSourceID="odsPatientByID" AutoGenerateColumns="False" Width="100%" >
<HeaderStyle CssClass="invisible" />
<RowStyle Width="100px" />
<Columns>
<asp:HyperLinkField DataNavigateUrlFields="PATIENT_ID" DataNavigateUrlFormatString="~/demographics/search_demographics.aspx?PatientID={0}" Text="DEMOGRAPHICS " ItemStyle-HorizontalAlign="Left" >
</asp:HyperLinkField>
<ItemTemplate >
<asp:Label SkinID="headerline" ID="lblNAME" runat="server" Text=' Name: ' />
<asp:Label SkinID="headerline" ID="lblPTNAME" runat="server" Text='<%# Shis.SCR.UI.Common.CapitalisePatientName(Eval("PT_NAME")) %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField >
<ItemTemplate >
<asp:Label SkinID="headerline" ID="lblDoB" runat="server" Text=' DoB: ' />
<asp:Label SkinID="headerline" ID="lblDateofBirth" runat="server" Text='<%# Bind("N1_10_DATE_BIRTH") %>' />
<asp:Label skinID="headerlineage" ID="lblAge" runat="server" Text='<%# GetDisplayAge("" & Eval("N1_10_DATE_BIRTH"),"" & Eval("L_DEATH_STATUS")) %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField >
<ItemTemplate >
<asp:Label SkinID="headerline" ID="lblSex" runat="server" Text=' Gender: ' />
<asp:Label SkinID="headerline" ID="lblGender" runat="server" Text='<%# EVAL("GENDER") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
I display the demographic data like this and it works fine
<div>
<controls:Demoline id="demoLine1" runat="server" />
</div>
What I would like to do is hide the HyperLinkfield when I select a Print option on the page and I get taken to the print page. Is this possible and if so how?

Answer 1

Look into RowDataBound event for the grid, it fires every time a row is bound to the grid. Do you check for a print param, from querystring or where ever and hide hyperlink. On phone so don't have code to hand
Look at
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.rowdatabound(v=vs.110).aspx
Give your Hyperlink an id eg "MyHyperLink"
add this code:
protected void GridView1_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (Request.QueryString["print"] != "1")
return;
var link = e.Row.FindControl("MyHyperLink") as HyperLink;
if (link != null)
link.Visible = false;
}
and then my add to your asp:GridView element:
OnRowDataBound="GridView1_OnRowDataBound"