Posts Tagged AjaxControlToolkit

Revised:Cascadingdropdown causes invalid postback or callback argument error

A while back I wrote a post about how to solve the error message you can get from using the Cascading Dropdown Extender from the Ajax Control Toolkit which is: “Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation=”true”/> in configuration or <%@ Page EnableEventValidation=”true” %> in a page. For security purposes, […]

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CascadingDropDown causes invalid postback or callback argument error

Update 2011-04-09 I have created a new post that included an example application here. Have a look at this markup: In this page I have three dropdown lists with the CascadingDropDown extender attached to them, not going to go into details how I set them up (maybe some other time) though. The issue was in […]

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