javascript and asp.net using json
<p>I've question about asp.net and javascript post and get, I know how to get the value from drop down list in asp.net connected to database, but how to send thing to asp.net and asp.net send it back ...</p>

<pre><code>&lt;div id="map" style="width: 500px; height: 500px"&gt;
        &lt;asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="&lt;%$ ConnectionStrings:RFIDConnectionString %&gt;" 
            SelectCommand="SELECT neighborhood_name FROM [Neighborhood]"&gt;&lt;/asp:SqlDataSource&gt;
        &lt;asp:SqlDataSource ID="SqlDataSource2" runat="server" 
            ConnectionString="&lt;%$ ConnectionStrings:RFIDConnectionString %&gt;" 
            SelectCommand="SELECT street_name FROM [Street]"&gt;&lt;/asp:SqlDataSource&gt;
         &lt;asp:SqlDataSource ID="SqlDataSource3" runat="server" 
            ConnectionString="&lt;%$ ConnectionStrings:RFIDConnectionString %&gt;" 
            SelectCommand="select * from Street,neighborhood where Street_status='high' and street.neighborhood_id=neighborhood.neighborhood_id"&gt;&lt;/asp:SqlDataSource&gt;
         &lt;asp:SqlDataSource ID="SqlDataSource4" runat="server" 
            ConnectionString="&lt;%$ ConnectionStrings:RFIDConnectionString %&gt;" 
            SelectCommand="SELECT neighborhood_name FROM [Neighborhood]"&gt;&lt;/asp:SqlDataSource&gt;

                &lt;/div&gt;
</code></pre>
