a. Check whether the Sim.Web.UI.dll
is referenced in your project. To do this, select your web project in Solution Explorer
then select Website > Add Reference… from the toolbar, then
select the Sim.Web.UI.dll from the installed directory.
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b. Check whether PersianDate control is referenced in your
.aspx page. If not add a reference to
Sim.Web.UI.dll with this syntax:
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<%@
Register Assembly="Sim.Web.UI, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=d97b8d4c0ee7b4ba"
Namespace="Sim.Web.UI.WebControls"
TagPrefix="sim"
%>
c. Make sure PersianDate is not referenced twice in your
project, this is happened when you already tried the Trial version and now
installed the Release. If it is, remove the reference with
"PublicKeyToken=5E28C8E02D000E0D" in the assemblies part of the compilation
section in the Web.config .
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<compilation
debug="true">
<assemblies>
<add
assembly="Sim.Web.UI….
</assemblies>
</compilation>