FriendlyNameAttribute class
SharePoint 2013
Specifies the caption displayed in the property pane for a Web Part's custom property. If you don't specify this attribute, the actual property name will be displayed in the property pane.
Namespace: Microsoft.SharePoint.WebPartPages
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
The attributes that determine the caption that is displayed for a custom property are applied in the following order. If the ResourcesAttribute attribute is not specified, then the value of the FriendlyNameAttribute attribute is used. If the FriendlyNameAttribute attribute is not specified, then the actual property name is used.
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