To retrieve an Item Alias Name using the SAP Business One SDK in VB.NET, you can use the following code snippet
 Public Function GetItemAliasName(ByVal SBO_Application As SAPbouiCOM.Application, ByVal oFormType As String, ByVal strItemUid As String, Optional ByVal strColUid As String = "") As String
        Dim resource As SAPbouiCOM.ResourceData = Nothing
        Dim oFormInfo As SAPbouiCOM.FormInfo = Nothing
        Dim oItemInfo As SAPbouiCOM.ItemInfo = Nothing
        Dim strFormType As String = String.Empty
        resource = SBO_Application.ResourceData
        oFormInfo = resource.GetFormInfo(oFormType)
        Try
            oItemInfo = oFormInfo.GetItemInfo(strItemUid, strColUid)
            strFormType = oItemInfo.Alias.Trim
        Catch ex As Exception
            strFormType = String.Empty
        Finally
            If resource IsNot Nothing Then
                resource = Nothing
            End If
            If oFormInfo IsNot Nothing Then
                oFormInfo = Nothing
            End If
            If oItemInfo IsNot Nothing Then
                oItemInfo = Nothing
            End If
        End Try
        Return strFormType.Trim
    End Function