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Form f = Application.OpenForms["TestForm"];
if (f == null)
{
Form frm = ContextRegistry.GetContext().GetObject("TestForm") as Form;
frm.ShowDialog(this);
frm.Dispose();
}
else
{
f.Activate();
f.Focus();
}
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="spring">
<section name="context" type="Spring.Context.Support.ContextHandler, Spring.Core"/>
<section name="objects" type="Spring.Context.Support.DefaultSectionHandler, Spring.Core"/>
</sectionGroup>
</configSections>
<spring>
<context>
<resource uri="config://spring/objects"/>
</context>
<objects xmlns="http://www.springframework.net">
<object id="TestForm" type="Xxxxx.TestForm, Xxxxx">
</object>
</objects>
</spring>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/></startup></configuration>