I do something very similar in some of our installs. What I do is on the
Next button I run my CA that validates the data, in this case a database
connection string. If it's valid it moves on to the next dialog. If the
connection cannot be validated a SpawnDialog event is triggered to display
the SQL error, leaving them on the same dialog.
Here are the relevant WiX pieces, slightly edited to remove additional
dialog flow conditions, etc that do not apply here.
<Control Id="Next" Type="PushButton" X="236" Y="243" Width="56"
Height="17" Default="yes" Text="Next">
<Publish Event="DoAction" Value="VerifyDbConnection" Order="1">
<![CDATA[1]]>
</Publish>
<Publish Event="SpawnDialog" Value="DatabaseErrorDlg" Order="2">
<![CDATA[VALID_DB_CONN=0]]>
</Publish>
<Publish Event="NewDialog" Value="YourNextDlg" Order="3">
<![CDATA[VALID_DB_CONN=1]]>
</Publish>
</Control>
<!-- Database Connection - Custom Error dialog -->
<Dialog Id="DatabaseErrorDlg" Width="300" Height="125"
Title="[ProductName] Setup">
<Control Id="Error" Type="Text" X="20" Y="15" Width="270" Height="25"
Transparent="yes" NoPrefix="yes" Text="SQL Connection Failed:" />
<Control Id="ErrorText" Type="Text" X="20" Y="40" Width="270"
Height="60" Transparent="yes" NoPrefix="yes"
Text="[DATABASE_CONNECTION_ERROR]" />
<Control Id="OK" Type="PushButton" X="230" Y="95" Width="40"
Height="17" Text="OK">
<Publish Event="EndDialog" Value="Return" />
</Control>
</Dialog>
-Mike
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