The trick to passing data from Javascript and Asp.Net is to use hidden inputs in the html. The hidden inputs should have the runat="server" attribute. For example: <input type="hidden" runat="server" id="hiddenfield" value="" /> Then in the Javascript, whatever value you are trying to pull from Asp.Net, set the hidden field using: document.getElementById("hiddenfield").value = "whatever value you want to set" And in the Asp.net form, you can just access the hiddenfield by using its id. string x = hiddenfield.value.text Thats all there is to it. You might need to check the syntax of it first as this is just all from my head.
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