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Databinding and querystring

Posted on 2006-10-24
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Last Modified: 2008-02-01
Hi,

I have bound a view to a data list.  I'm displaying the information using the following string which i'm sure is familiar to you:

<asp:Label id=lblFirstName runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.FirstName", "{0}") %>'>
                  </asp:Label>

I want to pass the ID of this user via the querystring.  I have tried the following but get errors.

<asp:HyperLink id="Hyperlink2" CssClass="subhead" runat="server" Visible="true" NavigateUrl="../../../ProfileView/tabid/60/default.aspx?<%# DataBinder.Eval(Container, "DataItem.UserID", "{0}") %>">Details</asp:HyperLink>

I assume this isn't correct; would anyone know the correct way to do this?

Thanks
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Question by:mitesh114
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Expert Comment

by:nepali
ID: 17794443
Hi,
Try this out
you request your page with a querystring say its "aaa".
eg. http://127.0.0.1/TestWeb1/webform1.aspx?aaa=123

and in your aspx page you can add the following to get the value.
      <%# Request.QueryString("aaa")%>

But this is a databinding expression. Hence it will be called or executed only if you call the DataBind() method in your page.
For that you just have to add DataBind(); statement to your page_load method. That's it.
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Author Comment

by:mitesh114
ID: 17794470
Hi Nepali,

I have the databind() expression in my page_load.  the expression <%# DataBinder.Eval(Container, "DataItem.UserID", "{0}") %> works when I place it in labels text parameter but doesn't seem to work with the navigateURL property.

Mitesh
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LVL 7

Expert Comment

by:nepali
ID: 17794654
Ohhh Kaay... for that just replace the "" (double quotes on dataitem.userid and the format specifier "{0}" by single quotes ''

use the following.
<asp:HyperLink id="Hyperlink2" CssClass="subhead" runat="server" Visible="true" NavigateUrl="../../../ProfileView/tabid/60/default.aspx?<%# DataBinder.Eval(Container, 'DataItem.UserID', '{0}') %>">Details</asp:HyperLink>
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Author Comment

by:mitesh114
ID: 17794713
Thanks Nepali,

Here's what it returns though:

http://localhost/dnn_a/UserProfile/tabid/ProfileView/tabid/60/default.aspx?myID=<%#%20DataBinder.Eval(Container,%20'DataItem.UserID',%20'{0}')%20%>

Instead of returning the ID it returns
<%#%20DataBinder.Eval(Container,%20'DataItem.UserID',%20'{0}')%20%>
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Expert Comment

by:nepali
ID: 17794738
oops sorry that will not work.. give me some time i'll work this out...
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Expert Comment

by:nepali
ID: 17794788
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Accepted Solution

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nepali earned 1000 total points
ID: 17795184
heres ur solution
<asp:HyperLink id="Hyperlink2" CssClass="subhead" runat="server" Visible="true"  NavigateUrl='<%# DataBinder.Eval(Container,"DataItem.UserID", "../../../ProfileView/tabid/60/default.aspx?{0}") %>'>Details</asp:HyperLink>
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Author Comment

by:mitesh114
ID: 17795276
Nepali,

It worked!!  Many many thanks for helping.

Regards

Mitesh
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