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How can I have the list of all existing SharePoint Web Applications and their site collections from code behind .

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up vote 2 down vote accepted
foreach (SPWebApplication webApp in SPWebService.ContentService.WebApplications)
    string webUrl = webApp.GetResponseUri(SPUrlZone.Default).AbsoluteUri;
    SPSiteCollection sites = webApp.Sites;
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SPWebApplicationCollection webAppColl = SPWebService.ContentService.WebApplications;

if (webAppColl != null)
   foreach (SPWebApplication spWebApp in webAppColl)
        SPSiteCollection sites = spWebApp.Sites;
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