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Gets or sets a Boolean value that specifies whether to display the week number in day or week views of a calendar.
Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
Syntax
'Declaration
Public Property ShowWeeks As Boolean
    Get
    Set
'Usage
Dim instance As SPRegionalSettings
Dim value As Boolean
value = instance.ShowWeeks
instance.ShowWeeks = value
public bool ShowWeeks { get; set; }
Property Value
Type: System.Boolean
true to display weeks on the calendar; otherwise, false.
Examples
The following code example sets the calendar type to Gregorian and enables display of the week number.
Dim siteCollection As New SPSite("https://localhost")
Try
    Dim rootWebSite As SPWeb = siteCollection.RootWeb
    Dim regionalsettings As SPRegionalSettings = rootWebSite.RegionalSettings
    regionalsettings.CalendarType = 0
    regionalsettings.ShowWeeks = True
    rootWebSite.Update()
    rootWebSite.Dispose()
Finally
    siteCollection.Dispose()
End Try
using (SPSite oSiteCollection = new SPSite("https://localhost"))
{
    using (SPWeb oWebsiteRoot = oSiteCollection.RootWeb)
    {
        SPRegionalSettings oRegionalSettings = oWebsiteRoot.RegionalSettings; 
        oRegionalSettings.CalendarType = 0; 
        oRegionalSettings.ShowWeeks = true; 
        oWebsiteRoot.Update(); 
    }
}
Note
Certain objects implement the IDisposable interface, and you must avoid retaining these objects in memory after they are no longer needed. For information about good coding practices, see Disposing Objects.