Sets or returns the category of the spreadsheet. The category property can be used to search for an Excel file. 

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 public System.String Category{ get; set; }
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<p>Public Property Category() As String</p>

          //--- Get Category
          string category = docProps.Category;

          //--- Set Category
          docProps.Category = "Sales Reports";
        

          '--- Get Category
          Dim category As String = docProps.Category

          '--- Set Category
          docProps.Category = "Sales Reports"