VB.Net - Syntax

Enum enShapes 'As integer - by default  
   Triangle      ' This is assumed to be zero  
   Square '1  
   Rectangle '2  
   Circle ' 3  
   Unknown = -999 
End Enum 

Dim Shape As enShapes = enShapes.Triangle 

System.Windows.Forms.MessageBox.Show([System.Enum].GetName(GetType(EN_SHAPES,2);   // = Green 

Even though Enum values are internally stored as integers, by default you are not allowed to assign a number to an Enum variable if Option Strict is on.
You must convert the number to the proper Enum type before assigning it an Enum variable.

Shape = CType(1, enShapes)