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Passing values from Javascript to Asp.Net

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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