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copied!<p>Based on the fact above what I did is something interesting which I haven't came across earlier.</p> <p>For an instance I have wrote what my problem was. Basically it's the postback error which occurs when you click and select an option from JavaScript, so what you can do is:</p> <p>Create a custom control which is based on extending the <code>System.Web.Ui.WebControls.Dropdownlist</code>, and instead of using <code><asp:dropdownlist></code> just use that.</p> <p>Here is the code for that for custom class:</p> <pre><code> public class DropDown:System.Web.UI.WebControls.DropDownList { } </code></pre> <p>To the reference I would give you a very good blog post for that which actually has dealt with this problem which quite didn't help out with my original problem.</p> <p><a href="http://johanleino.wordpress.com/2009/11/17/cascadingdropdown-casues-invalid-postback-or-callback-argument-error/#comment-286" rel="nofollow noreferrer">Postback Error Blog</a></p> <p>But I could actually figure out what was the problem. Basically what happens is when I populate a dropdownlist with a jQuery AJAX on a cascading effect. The viewstate actually doesn't gets updated, so as a result when I click a button for postback it gives the error as:</p> <pre><code>nvalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page </code></pre> <p>Now to avoid that I have already given the link.</p> <p>Now to solve the problem how to get the value. For that I have put an hiddenfield for the page for the cascading dropdown and have set its value to dropdowns selected value to hiddenfield. Now on button click I can get the actual value from the dropdown (which is basically a custom control) like : </p> <pre><code>$('[id*="btnSubmit"]').click(function() { $('[id*="hf"]').val($('[id*="ddProjectName"]').find("selected").val()); }); Note: You cannot do the textbox1.text = ddcustom.selectedvalue </code></pre> <p>and now you can access the value from button as like:</p> <pre><code>protected void btnSubmit_Click(object sender, EventArgs e) { String Project_id= hf.value; } </code></pre> <p>It's because the viewstate doesn't provide with the client side data which has been changed from cascading effect from jQuery AJAX.</p>

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