如何使不同的按钮区分为包含图片和不包含图片？

如何解决如何使不同的按钮区分为包含图片和不包含图片？

我有一个按钮可以上传图片。我想区分数据库中有图片与否之间的按钮。我想要（（按钮A））的图片部分不为空。我想要（（按钮B））替换或在图片部分为空时出现。我不知道如何编码。我有什么办法解决这个问题？

这是按钮的.aspx代码

<a href="#" class="btn btn-success"  onclick="popitup('Fetch_Image.aspx?id=' + <%# Eval("id")%>); 
return false;">Actual Image</a>

这是要从sql Server调用的整个接口的VB.NET代码。

Private Sub BindRepeater() 'displays the values of a data source in a table where each column represents a field and each row represents a record
    Dim cn As String = ConfigurationManager.ConnectionStrings("TarifCodeConnectionString4").ConnectionString
    Using cs As New sqlConnection(cn)
        Using cmd As New sqlCommand("SELECT * from masterlist",cs)
            Using sda As New sqlDataAdapter(cmd)
                Dim dt As New DataTable()
                sda.Fill(dt)
                rptTableuser3.DataSource = dt
                rptTableuser3.DataBind()
            End Using
        End Using
    End Using
End Sub

这是用户单击按钮后下一页上载图片的代码

 If id <> "" Then
 Dim dt As DataTable = GetData("SELECT ImagePic FROM masterlist WHERE id ='" & 
 Request.QueryString("id") & "'") 'image data will be select depend on what user search in the search textBox
        If dt.Rows.Count > 0 Then

            Dim bytes As Byte() = DirectCast(dt.Rows(0)("ImagePic"),Byte())
            Dim ms As MemoryStream
            ms = New MemoryStream(bytes,bytes.Length)
            ms.Write(bytes,bytes.Length)
            Dim base64String As String = Convert.ToBase64String(bytes,bytes.Length)
            Image1.ImageUrl = Convert.ToString("data:images/png;base64,") & base64String

            cs.open()
            cmd.CommandText = "SELECT hscode_c,partname FROM Masterlist WHERE id = '" + Request.QueryString("id") + "'" 'TO disPLAY HS CODE AND DESCRIPTION INTO THE TEXT Box
            cmd.Connection = cs
            reader = cmd.ExecuteReader

            If reader.HasRows Then
                While reader.Read
                    uhscode = reader.Item("hscode_c").ToString()
                    uDescription = reader.Item("partname").ToString()
                End While
            End If
            reader.Close()
            cs.Close()
        Else
            Image1.ImageUrl = ""
            Image1.AlternateText = "No image present in database with the name" 'if there is no image  in db the messege will display
        End If
    End If

更清楚地说，（（ACTUAL IMAGE））是我想在数据库中没有图像时更改的按钮。