asp.net – 在div点击执行serverside代码

<div id="c" runat="server" onclick="loadContentFamily" onmousedown="loadContentFamily" rel="divUpdatePanel" >Family</div>

ServerSide代码

Public Sub loadContentFamily(ByVal PageName As String)
        MsgBox("")
        PageName = "Family"
        Dim _con As New SqlConnection(ConfigurationManager.ConnectionStrings("LeaveDBConnectionString").ConnectionString)
        Dim _da As New SqlDataAdapter("SELECT PageHeader,PageContent FROM PageKeeper WHERE PageName='" & PageName & "'",_con)
        Dim _table As New DataTable

        Try
            _con.Open()
            _da.Fill(_table)
            _con.Close()
            _con.Dispose()
            With _table.Rows(0)
                h4header.InnerText = .Item(0)
                divUpdatePanel.InnerHtml = .Item(1)
                Me.Title = .Item(0)
            End With

        Catch ex As Exception
            MsgBox(ex.Message)
            divUpdatePanel.InnerText = "No Data Found"
        Finally
            _con.Close()
            _con.Dispose()
        End Try
    End Sub

问题：

当我点击div它不执行ServerSide代码…为什么??任何帮助赞赏.