Hyperlink in Gridview

[stoogots2]

I have wasted a couple of hours trying to add a hyperlink to a templatecolumn in a gridview. I already have a HyperlinkField working in the gridview, but I would like nothing to be displayed if the DataTextField associated with the field is blank. Right now it is showing a "broken" url. I would just like to add a condition that says if this DataTextField is not DBNull, show the hyperlink, otherwise show nothing. Any pointers would be appreciated...

[tlhintoq]

Please show the code you have thus far so we can all be on the same page

[stoogots2]

Code As Requested

This is a column within a GridView. The problem is that I want the hyperlink to be blank if TEMP is DBNull. In the destination page I grab the querystring value for TEMP and query SQL server.

<asp:HyperLinkField DataTextField="TEMP" DataNavigateUrlFields="TEMP"
                     DataNavigateUrlFormatString="Update.aspx?TEMP={0}" HeaderText="TEMP" 
                    HeaderStyle-ForeColor="#ff9100" ControlStyle-Width="40"/>

[tlhintoq]

I'm not an ASP guy, but concepts come before language.
Can't you get the result of your query before you stick it in the gridview?
If the result != null then do what you're doing
else don't.

[stoogots2]

That probably doesn't meet my needs because I have several GridViews showing similar data and this is only one field. I need this to happen when binding occurs to the actual GridView columns.

I was hoping to do this with an Eval type statement as this is not the only field in the Gridview. For some reason I was not able nail down the correct coding for it (not having done it before). I am evaluating dates and other fields, but nothing in a HyperlinkField.

[tlhintoq]

Could you do something with the ? construct?

variable = ConditionToEval uate ? ReturnedTrueVal ue : ReturnedFalseVa lue ;

Where the condition to evaluate is the link and if its null return string.empty and if not null then return a real string for the link?

[Frinavale]

In your Server Code implement a method that handles the RowDataBound event and set the URL of the hyperlink by hand there.

[bhupinder]

Try this code

<asp:GridView ID="gvdata" runat="SERVER" AutoGenerateColumns="false">
    <Columns>
    <asp:BoundField DataField="benefit_id" HeaderText="ID" />
    
        <asp:TemplateField>
            <ItemTemplate>
                <asp:HyperLink ID="hyper" runat="server" Text='<%#eval("benefit") %>' ></asp:HyperLink>
                
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
  </asp:GridView>

VB Code

Protected Sub gvdata_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvdata.RowDataBound
        If e.Row.RowType = DataControlRowType.DataRow Then
            Dim hyper As HyperLink = CType(e.Row.Cells(1).FindControl("hyper"), HyperLink)
            If hyper.Text = "" Then
                hyper.Text = ""
            Else
                hyper.Text = "asdsa"

            End If
        End If
    End Sub

[tlhintoq]

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.