DataBinder.Eval usage in Href [modified]

thenewbee

I have problem with this line of code in my asp.net page. Its showing error. Can anyone help me? my Soucre Code is as follows:

<asp:datagrid style="Z-INDEX: 101; POSITION: absolute; TOP: 136px; LEFT: 192px" id="DataGrid1"
runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn HeaderText="test">
<ItemTemplate>
<a href="www.yahoo.com?id=12" runat="server" id="h1">click</a>
<asp:TextBox runat="server" ID="Textbox1" NAME="Textbox1" Visible="False"></asp:TextBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:ButtonColumn Text="Button" HeaderText="edit" CommandName="ed"></asp:ButtonColumn>
<asp:TemplateColumn HeaderText="Invoice No">
<ItemTemplate>
<a id ="h2" runat="server" href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>

Iam using VS 2003 When i changed to Design View i got the following error Could not open in Design view. Quote values differently inside a '<% ..."value"... %>' block.

modified on Wednesday, January 6, 2010 1:23 AM

meeram395 · modified on Wednesday, January 6, 2010 1:23 AM

It would be really helpful if you can provide the error message. Are you using any server control along with this? Can you provide full html source code?

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J4amieC · modified on Wednesday, January 6, 2010 1:23 AM

You cant mix databainding expressions and constant text in an attribute value, you have to concatenate it all in the databinding expression:

Click Here

NB: Pay special attention to the usage of single & double quotes in the above example.

modified on Wednesday, January 6, 2010 4:24 AM

Abhishek Sur · modified on Wednesday, January 6, 2010 1:23 AM

I think runat="server" is the culprit. Just remove it if you dont need. If you want runat="server" you can assign the href from the Server Side. I mean If it is inside an asp:Repeater to it inside ItemDataBound event.

Abhishek Sur **Don't forget to click "Good Answer" if you like this Solution.

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thenewbee

<asp:datagrid style="Z-INDEX: 101; POSITION: absolute; TOP: 136px; LEFT: 192px" id="DataGrid1"
runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn HeaderText="test">
<ItemTemplate>
<a href="www.yahoo.com?id=12" runat="server" id="h1">click</a>
<asp:TextBox runat="server" ID="Textbox1" NAME="Textbox1" Visible="False"></asp:TextBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:ButtonColumn Text="Button" HeaderText="edit" CommandName="ed"></asp:ButtonColumn>
<asp:TemplateColumn HeaderText="Invoice No">
<ItemTemplate>
<a id ="h2" runat="server" href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>

Iam using VS 2003 When i changed to Design View i got the following error Could not open in Design view. Quote values differently inside a '<% ..."value"... %>' block.

thenewbee · modified on Wednesday, January 6, 2010 4:24 AM

Sorry i misplaced the code Here is my full code

<asp:datagrid style="Z-INDEX: 101; POSITION: absolute; TOP: 136px; LEFT: 192px" id="DataGrid1"
runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateColumn HeaderText="test">
<ItemTemplate>
<a href="www.yahoo.com?id=12" runat="server" id="h1">click</a>
<asp:TextBox runat="server" ID="Textbox1" NAME="Textbox1" Visible="False"></asp:TextBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:ButtonColumn Text="Button" HeaderText="edit" CommandName="ed"></asp:ButtonColumn>
<asp:TemplateColumn HeaderText="Invoice No">
<ItemTemplate>
<a id ="h2" runat="server" href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>

Iam using VS 2003 When i changed to Design View i got the following error Could not open in Design view. Quote values differently inside a '<% ..."value"... %>' block.

thenewbee

<asp:datagrid style="Z-INDEX: 101; POSITION: absolute; TOP: 136px; LEFT: 192px" id="DataGrid1" runat="server" AutoGenerateColumns="False"> <Columns> <asp:TemplateColumn HeaderText="test"> <ItemTemplate> <a href="www.yahoo.com?id=12" runat="server" id="h1">click</a> <asp:TextBox runat="server" ID="Textbox1" NAME="Textbox1" Visible="False"></asp:TextBox> </ItemTemplate> </asp:TemplateColumn> <asp:ButtonColumn Text="Button" HeaderText="edit" CommandName="ed"></asp:ButtonColumn> <asp:TemplateColumn HeaderText="Invoice No"> <ItemTemplate> <a id ="h2" runat="server" href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:datagrid> Iam using VS 2003 When i changed to Design View i got the following error Could not open in Design view. Quote values differently inside a '<% ..."value"... %>' block.

J4amieC

Did you actually read my answer? :wtf:

J4amieC

Abhishek Sur wrote:

I think runat="server" is the culprit

No, really its not!

Abhishek Sur wrote:

you can assign the href from the Server Side. I mean If it is inside an asp:Repeater to it inside ItemDataBound event.

Why? Thats just 10x more complicated than expressing it as an attribute.

Abhishek Sur

J4amieC wrote:

Why? Thats just 10x more complicated than expressing it as an attribute.

Yes.. Event if it is complicated, but ASP.NET is meant to deal with this events. It is better to handle server controls in the server and client control in the designer. I generally dont mix both in designer. Well, its upon the choice though.. ;)

Abhishek Sur **Don't forget to click "Good Answer" if you like this Solution.

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J4amieC

Abhishek Sur wrote:

It is better to handle server controls in the server and client control in the designer

But the markup is also dealt with by the server:confused:

thenewbee

href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a> Here i havent used the concatenation but i have the problem with the quotation marks.

J4amieC

Seeing as you cant be bothered to read my answer, i cant be bothered to retype it, so i'll jusdt copy/paste from my answer

J4amieC wrote:

<a runat="server" id="h2" href='<%# "frmViewInvoiceDetails.aspx?invoiceID=" + DataBinder.Eval(Container.DataItem, "firstname")%>'> NB: Pay special attention to the usage of single & double quotes in the above example.

thenewbee

Ok i understood that but can u plz help me to give proper quotation for the below code href= "frmViewInvoiceDetails.aspx?invoiceID=<%#DataBinder.Eval(Container,"DataItem.InvoiceID")%>">Click Here</a>

J4amieC

That code will never work - once again i'll copy from my original answer (this is getting boring) "You cant mix databainding expressions and constant text in an attribute value, you have to concatenate it all in the databinding expression:"

Abhishek Sur

I know... It is actually parse through the marker during Page Initialization.... But I think those events are meant to handle those, so why do we avoid them and make all those unnecessary adjustments in the Markup. I always like clean html in the designer with Server Controls in place as well.. It is true, that sometimes I need to do those classic ASP style Server tags in designer, but I do like avoiding those. We create Server controls to have better grip of server side (which is the main motive of ASP.NET) which is absent in the Classic ASP where we always need to write Server Tags in between htmls. For instance we can easily write : <asp:Label runat="server" Id="lbl" Text="<%=this.X %>"></asp:Label> (infact it will render nothing in the page) but we dont do, rather we use Page_Load and then set lbl.Text = this.X; Anyways, some like to write more and more Servertags within html, but personally I always like to handle them from codebehind, if it is avoidable. :):thumbsup:

Abhishek Sur **Don't forget to click "Good Answer" if you like this Solution.

My Latest Articles-->** Windows7 API Code Pack
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