Project myProject = m_oProject; // A valid project
Page myPage = myProject.Pages[0]; // A valid Page object

// Define test property
MultiLangString mlsTestValue = new MultiLangString();
mlsTestValue.AddString(ISOCode.Language.L_de_DE, "Test043c");
string strPropertyIdentyfingName = "Page.Test043c";
UserDefinedPropertyDefinition oUDPD = UserDefinedPropertyDefinition.Create(myProject, strPropertyIdentyfingName, UserDefinedPropertyDefinition.Enums.ClientType.Page);

// Set test property on myPage
myPage.Properties[strPropertyIdentyfingName] = mlsTestValue;

// Search page with property value
DMObjectsFinder objFinder = new DMObjectsFinder(myProject);
PagesFilter pagesFilter = new PagesFilter();
PagePropertyList pagePropertyList = new PagePropertyList();
AnyPropertyId anyPropertyId = new AnyPropertyId(myProject, strPropertyIdentyfingName);

pagePropertyList[anyPropertyId] = mlsTestValue;
pagesFilter.SetFilteredPropertyList(pagePropertyList);
Page[] arrPages1 = objFinder.GetPages(pagesFilter);