Datalist onitemcommand is not working (ASP.NET)

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VB

ASP.NET

datalist

I have images displayed using the DataList() control. Each of image displayed have their own button inside to vote the image.

Goal and problem faced:
So I am trying to get access the image button using the DataList OnItemCommand but it's not working.

What I have tried:

DataList :

<asp:DataList Width="100%" ItemStyle-horizontalalign="center" ItemStyle-Width="200px" ID="imgDataList" runat="server" RepeatColumns="3" OnItemCommand="imgDataList_ItemCommand">

Button inside DataList :

<asp:Image ID="imgFavBefore" runat="server" CssClass="voteStyle" ImageUrl="~/Img Content/love.png" Style="height: 20px; width: 20px; align-content: center;" CommandName="btnFavBefore" data-index="<%#Container.ItemIndex %>" />

VB.Net code to get access on button inside DataList :

Protected Sub imgDataList_ItemCommand(source As Object, e As DataListCommandEventArgs)
  If e.CommandName = "btnFavBefore" Then
    ' some code here
  End If
End Sub