How to make one more eval merge ?
<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("Name"),Eval("Surname"),Eval("Mail")%>'/>
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<asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("Name") + "," + Eval("Surname") + "," + Eval("Mail")%>'/>