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Thanks for using Syncfusion products.
Before we start to provide you a solution, could you please give the following information.
1. Which dialog you have been using in your sample Syncfusion dialog or Jquery dialog?
2. Did you using External Jquery script files in your sample?
Please let us know the above information with us. If you have using Jquery scripts explicitly in your sample, we suggest you to prevent loading of Syncfusion source jquery script files. The source scripts files can be unloaded by using the following code snippets in web.config file.
<add key="webpages:Version" value="188.8.131.52"/>
<add key="sfJqueryload" value="false"/>
Also, please refer the below documentation link for further reference.
Documentation Link: http://help.syncfusion.com/ug/asp.net%20mvc/documents/howtocustomizethejqu.htm
Please let us know if you need further assistance.
Thanks for your update.
We sorry about the inconvenience caused. We are unable to reproduce your reported issue with Syncfusion Dialog. We have created simple sample and video demonstrating of the working sample and the same can be downloaded from the following link.
Sample link: http://www.syncfusion.com/downloads/support/directtrac/118443/MvcApplication10-324262502.zip
Video link: http://www.syncfusion.com/downloads/support/directtrac/118443/dialog-175161599.zip
Please try the above sample and get back to us whether you are able to reproduce the issue. If not, could you please give more information about the issue if possible please provide your issue replicated sample with us. So that we can work on this and provide you a better solution.
Please let us now if you need further assistance.