Translate a word using sql database in vn.net and ajax

Can anyone guide me how to replace a word from sql using vb and ajax with clicking a button?

I tried this backend code:

Using da As New SqlDataAdapter
                con.Open()
                cmd.CommandText = "SELECT value_en as value FROM tbl_language WHERE element_id = 'a1';"
                da.SelectCommand = cmd
                Dim dt As New DataTable
                da.Fill(dt)
                Dim WordValue As String = dt.Rows(0).Item(0)
  End Using

and in front end to display the word:

<%# Eval("WordValue")%>

My ajax:

$.ajax({
        type: "POST",
        cache: false,
        url: "http://ift.tt/1JxB6gu",
        data: {},
        success: alert("success"),
        error: alert("error")
    });

Buttons to translate:

 <form runat="server">
  <asp:RadioButtonList ID="change_language" runat="server"  AutoPostBack="True" 
        onselectedindexchanged="change_language_SelectedIndexChanged">
<asp:ListItem Selected="True" Value="english">English</asp:ListItem> 
<asp:ListItem Value="malay">Malay</asp:ListItem>
        </asp:RadioButtonList>
 </form>