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Editorial Team
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Asked: 2026-05-25T02:58:02+00:00

I have been just using what it wants for years and have never questioned

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I have been just using what it wants for years and have never questioned it, however, can someone tell me why I have to use single quote vs double quotes in order to be a well formed tag?

Error Msg:
“The server tag is not well formed.”

What are the rules for the single quote enforcement(ie: within a template…etc)?

 //not well formed
 <uc1:blaControl ID="bla" runat="server" Prop1="<%# Eval("Data") %>" />

vs

 //well formed
 <uc1:blaControl ID="bla" runat="server" Prop1='<%# Eval("Data") %>' />
 <asp:Literal ID="ControlTitle" runat="server" Text="<%# Title %>" />
 <asp:Literal ID="ControlTitle" runat="server" Text='<%# Title %>' />
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1 Answer

  1. Editorial Team

    Well the markup in the first is not valid SGML. The " inside the attribute are confused with the surrounding quotes so it’s not clear where the attribute begins an ends. To get around this you need to keep them different.

    // valid and will compile
<uc1:blaControl ID="bla" runat="server" Prop1='<%# Eval("Data") %>' />

    The reason you can’t alternatively use the following syntax which would be valid SGML, is that the C# inside the outer quotes becomes invalid and won’t compile (single quotes denote a char).

     // valid but won't compile
 <uc1:blaControl ID="bla" runat="server" Prop1="<%# Eval('Data') %>" />
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